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BoP Lab / Classes / B-Spec

B-Spec vs F5 vs SRF3 vs SM pace at every track

Lap times across years say as much about the weather as the class. % of B-Spec is each class's best lap as a share of B-Spec's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
ASB-Spec×EPvsF5×FAFCFE2FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXvsSRF3×STLSTUT1T2T3T4Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: B-Spec 100.0% of B-Spec John Heinricy, Daytona International Speedway Runoffs 2015 race · F5 81.6% of B-Spec W. Clint McMahan, Daytona International Speedway Runoffs 2015 qualifying · SRF3 85.7% of B-Spec Tyler Stephens, Road America Runoffs 2026 qualifying · SM 92.8% of B-Spec Andrew Carbonell, Daytona International Speedway Runoffs 2015 qualifying

1:402:002:202:403:0016 rule changes between Runoffs 2018 and Runoffs 201916 ▾32 rule changes between Runoffs 2019 and Runoffs 202032 ▾32 rule changes between Runoffs 2020 and Runoffs 202132 ▾20 rule changes between Runoffs 2021 and Runoffs 202220 ▾26 rule changes between Runoffs 2022 and Runoffs 202326 ▾44 rule changes between Runoffs 2023 and Runoffs 202444 ▾30 rule changes between Runoffs 2024 and Runoffs 202530 ▾20 rule changes between Runoffs 2025 and Runoffs 202620 ▾B-Spec race best at Runoffs 2015: 2:29.465 (John Heinricy)B-Spec race best at Runoffs 2016: 1:46.930 (John Heinricy)B-Spec race best at Runoffs 2017: 2:04.050 (David Daughtery)B-Spec race best at Runoffs 2018: 1:59.852 (Jake Pipal)B-Spec race best at Runoffs 2019: 2:22.094 (David Daughtery)B-Spec race best at Runoffs 2020: 2:52.847 (Riley Salyer)B-Spec race best at Runoffs 2021: 2:03.971 (Steve Introne)B-Spec race best at Runoffs 2022: 2:23.819 (Riley Salyer)B-Spec race best at Runoffs 2023: 2:23.732 (Richard Hromin)B-Spec race best at Runoffs 2024: 2:51.889 (Rob Piekarczyk)B-Spec race best at Runoffs 2025: 2:53.613 (Daniel Conway)B-Spec race best at Runoffs 2026: 2:51.633 (Josh Schmidt)B-Spec qualifying best at Runoffs 2015: 2:29.366 (John Heinricy)B-Spec qualifying best at Runoffs 2016: 1:46.865 (David Daughtery)B-Spec qualifying best at Runoffs 2017: 2:03.166 (David Daughtery)B-Spec qualifying best at Runoffs 2018: 1:59.321 (Oscar Jackson)B-Spec qualifying best at Runoffs 2019: 2:22.368 (Frank Schwartz)B-Spec qualifying best at Runoffs 2020: 2:52.033 (David Daughtery)B-Spec qualifying best at Runoffs 2021: 2:03.121 (John Phillips)B-Spec qualifying best at Runoffs 2022: 2:22.945 (Steve Introne)B-Spec qualifying best at Runoffs 2023: 2:22.707 (Riley Salyer)B-Spec qualifying best at Runoffs 2024: 2:52.027 (Daniel Conway)B-Spec qualifying best at Runoffs 2025: 2:52.211 (Josh Schmidt)B-Spec qualifying best at Runoffs 2026: 2:51.987 (Josh Schmidt)F5 race best at Runoffs 2015: 2:03.298 (Matthew Strand)F5 race best at Runoffs 2016: 1:29.853 (Steven Thompson)F5 race best at Runoffs 2017: 1:42.860 (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 1:42.491 (David Lapham)F5 race best at Runoffs 2019: 1:57.572 (Wiley Mcmahan)F5 race best at Runoffs 2020: 2:21.391 (James Weida)F5 race best at Runoffs 2021: 1:43.140 (Sven de Vries)F5 race best at Runoffs 2022: 2:21.862 (Sven de Vries)F5 qualifying best at Runoffs 2015: 2:01.824 (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 1:28.528 (Calvin Stewart)F5 qualifying best at Runoffs 2017: 1:43.136 (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 1:41.807 (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 1:57.361 (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 2:20.954 (Calvin Stewart)F5 qualifying best at Runoffs 2021: 1:42.619 (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 1:57.689 (James Weida)SRF3 race best at Runoffs 2015: 2:10.215 (Chad Galloway)SRF3 race best at Runoffs 2016: 1:34.947 (Cliff White)SRF3 race best at Runoffs 2017: 1:49.782 (Tray Ayres)SRF3 race best at Runoffs 2018: 1:47.053 (TJ Acker)SRF3 race best at Runoffs 2019: 2:04.755 (Bobby Sak)SRF3 race best at Runoffs 2020: 2:31.038 (Justin Hille)SRF3 race best at Runoffs 2021: 1:50.095 (John Black)SRF3 race best at Runoffs 2022: 2:22.066 (Franklin Futrelle)SRF3 race best at Runoffs 2023: 2:04.911 (David Ogburn)SRF3 race best at Runoffs 2024: 2:28.129 (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 2:29.839 (Morgan Burkhard)SRF3 race best at Runoffs 2026: 2:29.257 (Peyton Long)SRF3 qualifying best at Runoffs 2015: 2:08.557 (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 1:34.363 (John Black)SRF3 qualifying best at Runoffs 2017: 1:49.824 (John Black)SRF3 qualifying best at Runoffs 2018: 1:46.117 (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 2:04.624 (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 2:29.786 (TJ Acker)SRF3 qualifying best at Runoffs 2021: 1:49.520 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 2:03.716 (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 2:03.842 (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 2:27.773 (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 2:28.226 (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 2:27.443 (Tyler Stephens)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
B-SpecF5SRF3SMsolid race · dashed qualifying · slower is lower
85%90%95%100%16 rule changes between Runoffs 2018 and Runoffs 201916 ▾32 rule changes between Runoffs 2019 and Runoffs 202032 ▾32 rule changes between Runoffs 2020 and Runoffs 202132 ▾20 rule changes between Runoffs 2021 and Runoffs 202220 ▾26 rule changes between Runoffs 2022 and Runoffs 202326 ▾44 rule changes between Runoffs 2023 and Runoffs 202444 ▾30 rule changes between Runoffs 2024 and Runoffs 202530 ▾20 rule changes between Runoffs 2025 and Runoffs 202620 ▾B-Spec race best at Runoffs 2015: 100.0% of B-Spec's (John Heinricy)B-Spec race best at Runoffs 2016: 100.0% of B-Spec's (John Heinricy)B-Spec race best at Runoffs 2017: 100.0% of B-Spec's (David Daughtery)B-Spec race best at Runoffs 2018: 100.0% of B-Spec's (Jake Pipal)B-Spec race best at Runoffs 2019: 100.0% of B-Spec's (David Daughtery)B-Spec race best at Runoffs 2020: 100.0% of B-Spec's (Riley Salyer)B-Spec race best at Runoffs 2021: 100.0% of B-Spec's (Steve Introne)B-Spec race best at Runoffs 2022: 100.0% of B-Spec's (Riley Salyer)B-Spec race best at Runoffs 2023: 100.0% of B-Spec's (Richard Hromin)B-Spec race best at Runoffs 2024: 100.0% of B-Spec's (Rob Piekarczyk)B-Spec race best at Runoffs 2025: 100.0% of B-Spec's (Daniel Conway)B-Spec race best at Runoffs 2026: 100.0% of B-Spec's (Josh Schmidt)B-Spec qualifying best at Runoffs 2015: 100.0% of B-Spec's (John Heinricy)B-Spec qualifying best at Runoffs 2016: 100.0% of B-Spec's (David Daughtery)B-Spec qualifying best at Runoffs 2017: 100.0% of B-Spec's (David Daughtery)B-Spec qualifying best at Runoffs 2018: 100.0% of B-Spec's (Oscar Jackson)B-Spec qualifying best at Runoffs 2019: 100.0% of B-Spec's (Frank Schwartz)B-Spec qualifying best at Runoffs 2020: 100.0% of B-Spec's (David Daughtery)B-Spec qualifying best at Runoffs 2021: 100.0% of B-Spec's (John Phillips)B-Spec qualifying best at Runoffs 2022: 100.0% of B-Spec's (Steve Introne)B-Spec qualifying best at Runoffs 2023: 100.0% of B-Spec's (Riley Salyer)B-Spec qualifying best at Runoffs 2024: 100.0% of B-Spec's (Daniel Conway)B-Spec qualifying best at Runoffs 2025: 100.0% of B-Spec's (Josh Schmidt)B-Spec qualifying best at Runoffs 2026: 100.0% of B-Spec's (Josh Schmidt)F5 race best at Runoffs 2015: 82.5% of B-Spec's (Matthew Strand)F5 race best at Runoffs 2016: 84.0% of B-Spec's (Steven Thompson)F5 race best at Runoffs 2017: 82.9% of B-Spec's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 85.5% of B-Spec's (David Lapham)F5 race best at Runoffs 2019: 82.7% of B-Spec's (Wiley Mcmahan)F5 race best at Runoffs 2020: 81.8% of B-Spec's (James Weida)F5 race best at Runoffs 2021: 83.2% of B-Spec's (Sven de Vries)F5 race best at Runoffs 2022: 98.6% of B-Spec's (Sven de Vries)F5 qualifying best at Runoffs 2015: 81.6% of B-Spec's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 82.8% of B-Spec's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 83.7% of B-Spec's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 85.3% of B-Spec's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 82.4% of B-Spec's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 81.9% of B-Spec's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 83.3% of B-Spec's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 82.3% of B-Spec's (James Weida)SRF3 race best at Runoffs 2015: 87.1% of B-Spec's (Chad Galloway)SRF3 race best at Runoffs 2016: 88.8% of B-Spec's (Cliff White)SRF3 race best at Runoffs 2017: 88.5% of B-Spec's (Tray Ayres)SRF3 race best at Runoffs 2018: 89.3% of B-Spec's (TJ Acker)SRF3 race best at Runoffs 2019: 87.8% of B-Spec's (Bobby Sak)SRF3 race best at Runoffs 2020: 87.4% of B-Spec's (Justin Hille)SRF3 race best at Runoffs 2021: 88.8% of B-Spec's (John Black)SRF3 race best at Runoffs 2022: 98.8% of B-Spec's (Franklin Futrelle)SRF3 race best at Runoffs 2023: 86.9% of B-Spec's (David Ogburn)SRF3 race best at Runoffs 2024: 86.2% of B-Spec's (S Sandy Satullo III)SRF3 race best at Runoffs 2025: 86.3% of B-Spec's (Morgan Burkhard)SRF3 race best at Runoffs 2026: 87.0% of B-Spec's (Peyton Long)SRF3 qualifying best at Runoffs 2015: 86.1% of B-Spec's (Kerry Jacobsen)SRF3 qualifying best at Runoffs 2016: 88.3% of B-Spec's (John Black)SRF3 qualifying best at Runoffs 2017: 89.2% of B-Spec's (John Black)SRF3 qualifying best at Runoffs 2018: 88.9% of B-Spec's (Robeson Clay Russell)SRF3 qualifying best at Runoffs 2019: 87.5% of B-Spec's (Brian Schofield)SRF3 qualifying best at Runoffs 2020: 87.1% of B-Spec's (TJ Acker)SRF3 qualifying best at Runoffs 2021: 89.0% of B-Spec's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2022: 86.5% of B-Spec's (Franklin Futrelle)SRF3 qualifying best at Runoffs 2023: 86.8% of B-Spec's (Morgan Burkhard)SRF3 qualifying best at Runoffs 2024: 85.9% of B-Spec's (Denny Stripling)SRF3 qualifying best at Runoffs 2025: 86.1% of B-Spec's (Bobby Sak)SRF3 qualifying best at Runoffs 2026: 85.7% of B-Spec's (Tyler Stephens)SM race best at Runoffs 2015: 96.4% of B-Spec's (Todd Lamb)SM race best at Runoffs 2016: 94.2% of B-Spec's (Michael Carter)SM race best at Runoffs 2017: 96.0% of B-Spec's (Michael Gagliardo)SM race best at Runoffs 2018: 96.2% of B-Spec's (Michael Carter)SM race best at Runoffs 2019: 96.0% of B-Spec's (Elivan Goulart)SM race best at Runoffs 2020: 94.7% of B-Spec's (Preston Pardus)SM race best at Runoffs 2021: 95.9% of B-Spec's (Brian Henderson)SM race best at Runoffs 2022: 96.7% of B-Spec's (Travis Wiley)SM race best at Runoffs 2023: 94.8% of B-Spec's (Julian DaCosta)SM race best at Runoffs 2024: 93.9% of B-Spec's (Brett Kowalski)SM race best at Runoffs 2025: 94.7% of B-Spec's (Kyle Greenhill)SM race best at Runoffs 2026: 94.8% of B-Spec's (Francisco Barroso)SM qualifying best at Runoffs 2015: 92.8% of B-Spec's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 94.1% of B-Spec's (Justin Hille)SM qualifying best at Runoffs 2017: 96.1% of B-Spec's (Chris Haldeman)SM qualifying best at Runoffs 2018: 95.8% of B-Spec's (Ken Sutherland)SM qualifying best at Runoffs 2019: 94.5% of B-Spec's (Todd Buras)SM qualifying best at Runoffs 2020: 94.3% of B-Spec's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 95.6% of B-Spec's (Brian Henderson)SM qualifying best at Runoffs 2022: 94.2% of B-Spec's (Danny Steyn)SM qualifying best at Runoffs 2023: 94.6% of B-Spec's (Danny Steyn)SM qualifying best at Runoffs 2024: 93.7% of B-Spec's (Ethan Goulart)SM qualifying best at Runoffs 2025: 94.7% of B-Spec's (Bobby Gossett)SM qualifying best at Runoffs 2026: 94.3% of B-Spec's (Brett Kowalski)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
B-SpecF5SRF3SMsolid race · dashed qualifying · each class's best lap as a share of B-Spec's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventB-SpecF5SRF3SM
Qual best Race best Trap Qual best Race best Trap vs B-Spec % of B-Spec Qual best Race best Trap vs B-Spec % of B-Spec Qual best Race best Trap vs B-Spec % of B-Spec 
Road America Runoffs 20262026-09-282:51.987Josh Schmidt · fastest of 23 · top 5 within 1.3s-0.224s (-0.13%)2:51.633Josh Schmidt · fastest of 22 · top 5 within 1.7s-1.980s (-1.14%)112.5Ricky Holmstrom-0.2 mph (-0.1%)2:27.443Tyler Stephens · fastest of 44 · top 5 within 0.3s-0.783s (-0.53%)2:29.257Peyton Long · fastest of 42 · top 5 within 0.3s-0.582s (-0.39%)134.1Bobby Sak+0.4 mph (+0.3%)-22.376squal -24.544s87.0%qual 85.7%2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)-8.908squal -9.814s94.8%qual 94.3%
20 rule changes (B-Spec: 16, SRF3: 2, SM: 2)5 suspension & brakes · 5 weight · 1 engine · 1 induction · 1 wording · 7 othershowhide
  • SM Rear Toe Link #40271other
  • B-Spec ECU Location in Mazda2 #40034engine
  • B-Spec Allow Cars With Combined Brake/Clutch Reservoir to Separate. #40122suspension & brakes
  • B-Spec Race Memo RM 26-01 B-Spec Mini Cooper Weight Adjustments with OEM #40070weight
  • SM Part Number Change Request #39914wording
  • B-Spec Add Getrag GS5BG Transmisson Ratios for Mini R50 #39416suspension & brakes
  • B-Spec Exhaust Rules Update #39669other
  • B-Spec Please reinstate KW suspension for R56 #39727other
  • B-Spec Add approved replacement catalysts #39817other
  • B-Spec Yaris/Versa catalyst removal #39818other
  • SRF3 SRF3 Spark Plugs #39899other
  • B-Spec C-Spec Rear Sway Bars #39652suspension & brakes
  • B-Spec Notes section cleanup #39062weight
  • B-Spec 2026 BOP Recommendations #39475weight +25 lbs
  • B-Spec Expire NLA Mazda 2 Headers #39582weight
  • B-Spec Alternate Shift Cable Bushings and Rear Spring Seats #38472suspension & brakes
  • B-Spec Fiesta BOP Adjustment #38847weight +55 lbs
  • B-Spec Request to Remove Rear Shock From Spec Line Hyundai Accents/Kia #39017suspension & brakes
  • B-Spec Update Honda Fit MT (07-08) Runoffs Eligibility #39060induction
  • SRF3 Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:52.211Josh Schmidt · fastest of 19 · top 5 within 0.8s+0.184s (+0.11%)2:53.613Daniel Conway · fastest of 18 · top 5 within 0.4s+1.724s (+1.00%)112.7Stewart Black-0.4 mph (-0.3%)2:28.226Bobby Sak · fastest of 43 · top 5 within 0.6s+0.453s (+0.31%)2:29.839Morgan Burkhard · fastest of 42 · top 5 within 0.3s+1.710s (+1.15%)133.7Bobby Sak-1.5 mph (-1.1%)-23.774squal -23.985s86.3%qual 86.1%2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)-9.183squal -9.100s94.7%qual 94.7%
30 rule changes (B-Spec: 23, SRF3: 3, SM: 4)5 induction · 5 suspension & brakes · 4 weight · 1 cars added · 1 engine · 1 tyres & wheels · 2 wording · 11 othershowhide
  • B-Spec Remove Asterisk from Rule 9 #38768other
  • SRF3 SRF Rule Updates #38853weight
  • B-Spec Disabling 2 Pedal Shutdown #38354engine
  • B-Spec Update Honda Fit MT (07-08) Intake Allowance #38530induction
  • B-Spec Add Sedan spec lines for Hyundai & Kia #37537cars added
  • B-Spec Shifter Bushing Questions. #38048suspension & brakes
  • B-Spec Add Weapon R Intake to Honda Fit MT (09-14) Spec Line #38306induction
  • B-Spec Update Rule 46 #38307suspension & brakes
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • B-Spec Correct Hyundai/Kia Model Years #37943wording
  • B-Spec 07-08 Honda Fit MT Requests #37974weight +50 lbs
  • B-Spec Add B14 Kit Part # to Honda Fit (07-08) Spec line #38010other
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • B-Spec 2025 BOP Recommendations #37520weight
  • B-Spec Hyundai/Toyota Factory Rear Disc Models #37534weight
  • B-Spec Request to Update the Spec line for Hyundai Accent and Kia Rio #37880suspension & brakes
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
  • B-Spec Toyota Yaris Hatchback (12-18) rear disc brakes #37530suspension & brakes
  • B-Spec Yaris Speed Sensor #37536other
  • B-Spec Set Expiration Date For Fiat 500 #37689other
  • B-Spec Remove Redundant Language from Notes Sections #37337induction
  • B-Spec Expire designated spec lines #37517other
  • B-Spec Set expiration date for Nissan Micra Cup Cars (Canadian) #37519other
  • B-Spec Remove wheelbase from spec lines and replace with Restrictor #36074induction
  • B-Spec Bilstein Rear Shock Request for Hyundai Accent/Kia Rio #36965suspension & brakes
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • B-Spec Scion IA/Toyota Yaris/Mazda 2 DY chassis suspension #35780other
  • B-Spec Clean up 07-08 Honda Fit AT Notes Section #36542induction
Road America Runoffs 20242024-10-012:52.027Daniel Conway · fastest of 25 · top 5 within 0.7s-0.006s (-0.00%)2:51.889Rob Piekarczyk · fastest of 25 · top 5 within 0.6s-0.958s (-0.55%)113.1Joe McClughan+1.5 mph (+1.4%)2:27.773Denny Stripling · fastest of 57 · top 5 within 0.3s-2.013s (-1.34%)2:28.129S Sandy Satullo III · fastest of 52 · top 5 within 0.7s-2.909s (-1.93%)135.2Denny Stripling+3.4 mph (+2.6%)-23.760squal -24.254s86.2%qual 85.9%2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)119.9Alex Bertagnoli-1.4 mph (-1.2%)-10.403squal -10.921s93.9%qual 93.7%
44 rule changes (B-Spec: 30, SRF3: 10, SM: 4)9 suspension & brakes · 8 tyres & wheels · 6 weight · 4 engine · 3 induction · 2 removed · 1 cars added · 2 wording · 9 othershowhide
  • SRF3 Update SRF3 Air Filter Rule #36681other
  • SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF3 Hoosier Tire Decal Placement #36739tyres & wheels
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • B-Spec Update Tire Rules #35984tyres & wheels
  • B-Spec BOP help for the automatic B-Specs #36161weight -50 lbs
  • B-Spec Require hood pins #36233other
  • B-Spec Sonic Caliper Pistons #36238suspension & brakes
  • SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • B-Spec Clean up (15-19) Honda Fit MT & CVT Notes Sections #36068induction
  • B-Spec Set expiration date for Nissan Versa (09-11) #36069other
  • B-Spec Delete Redundant Rule 25 #36075removed
  • B-Spec Correct error for rear brakes of Hyundai/Kia #36174suspension & brakes
  • B-Spec Add B14 Kit Part # to Sonic Spec line In #35969induction
  • B-Spec Eliminate redundant sway bar end link part #s from notes In #35970suspension & brakes
  • B-Spec Update Fiat 500 Spec line In #35990other
  • B-Spec Update (15-19) Honda Fit #36067weight +25 lbs
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • B-Spec Delete trim levels/update language for spec lines #35746other
  • B-Spec Wheel Rules #36066tyres & wheels
  • B-Spec Change restrictor from 30mm to 31mm (2015+ Honda Fit) and add 50# #34857induction
  • B-Spec Wheel Offset and Spacer Revision #35466tyres & wheels
  • B-Spec Set Expiration Date for Unused Spec Lines #35742engine
  • B-Spec BOP Adjustment for Yaris iA, 2020+ Versa, and 07-08 Honda Fit #35382weight -125 lbs
  • B-Spec 07-08 Honda Fit Rear Sway Bar part # #35473suspension & brakes
  • B-Spec Eliminate Redundant Trans Cooler Rule #35353wording
  • B-Spec Fix Sonic Hatchback MT Spec Line #35371other
  • B-Spec Split Spec Line of Automatic and Manual 2nd Gen (09-14) Fit #35251cars added
  • B-Spec Equalize Mazda 2 Headers and clean up spec line #35259weight
  • B-Spec Rear Sway Bar Request for Nissan Versa and Versa Note 2013- #35323suspension & brakes
  • B-Spec B-Spec Hankook Tire for Regionals #35055tyres & wheels
  • B-Spec Update 12-19 Nissan Versa Spec Line & Adjust BOP #35074removed -60 lbs
  • B-Spec Clarifying the ECU and Data Acquisition language #35236engine
  • SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF3 SRF / SRF3 Rule Updates #35268weight
  • B-Spec Mazda 3i 2010-2013 5-Speed Manual Gear Ratios #34820other
  • B-Spec Error Correction #34955engine
  • B-Spec B-Spec Tire #35034tyres & wheels
  • SRF3 SRF Radiator Rule Update #34805other
Virginia International Raceway Runoffs 20232023-09-232:22.707Riley Salyer · fastest of 25 · top 5 within 1.0s-0.238s (-0.17%)2:23.732Richard Hromin · fastest of 23 · top 5 within 0.4s-0.087s (-0.06%)110.7Chris Daughtery-1.6 mph (-1.4%)2:03.842Morgan Burkhard · fastest of 40 · top 5 within 0.2s+0.126s (+0.10%)2:04.911David Ogburn · fastest of 39 · top 5 within 0.3s-17.155s (-12.08%)134.5Bobby Sak+0.1 mph (+0.0%)-18.821squal -18.865s86.9%qual 86.8%2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)-7.503squal -7.721s94.8%qual 94.6%
26 rule changes (B-Spec: 21, SRF3: 4, SM: 1)8 weight · 5 tyres & wheels · 4 suspension & brakes · 3 induction · 1 cars added · 1 engine · 4 othershowhide
  • B-Spec Initial car classifications and spec lines #34461weight
  • B-Spec Hyundai Accent Restrictor Plate #34331induction
  • B-Spec Hyundai Accent 2012 Model #34332other
  • B-Spec T5 Tire Options #33641tyres & wheels
  • B-Spec Allow ZZP Sonic Aluminum Radiator 1.68 #33660induction
  • B-Spec Fasteners for Bumper Caps #33797other
  • B-Spec Allow CAN Bus Connection to Data Systems #33806engine
  • B-Spec Request Ford Fiesta weight reduction 25lbs #33890weight -25 lbs
  • B-Spec BoB Adjustments #34208weight -25 lbs
  • B-Spec T5 Mazda 3 Spec Line Addition #33536cars added
  • B-Spec T5 Ride Height Rules. #33552suspension & brakes
  • B-Spec T5 Spring Allowance #33557suspension & brakes
  • B-Spec T5 Wheel Minimum Weight #33558weight
  • B-Spec Threaded Metal Inserts for Plastic Intake Manifolds #34164induction
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • B-Spec T5 Rules Feedback #33595weight
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • B-Spec Early Model Mini #33363other
  • B-Spec Helper Versus Tender springs. #33866suspension & brakes
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • B-Spec Split up Spec lines for Automatic/Manual 2nd Gen Fit #33292other
  • B-Spec Request to Split Spec Lines for Automatic Models #33270weight
  • B-Spec Tire Rule Request #33350tyres & wheels
  • SM BOP for NB1 and NB2 #32309weight
  • B-Spec Utilize the Data - Make BoP Changes #32179weight -225 lbs
Virginia International Raceway Runoffs 20222022-09-242:22.945Steve Introne · fastest of 30 · top 5 within 1.3s+0.577s (+0.41%)2:23.819Riley Salyer · fastest of 30 · top 5 within 0.8s+1.725s (+1.21%)112.3Matt Giuffre+0.1 mph (+0.1%)1:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)142.9Calvin Stewart+0.1 mph (+0.1%)-1.957squal -25.256s98.6%qual 82.3%2:03.716Franklin Futrelle · fastest of 44 · top 5 within 0.6s-0.908s (-0.73%)2:22.066Franklin Futrelle · fastest of 40 · top 5 within 1.2s+17.311s (+13.88%)134.5David Ogburn+2.1 mph (+1.6%)-1.753squal -19.229s98.8%qual 86.5%2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%)2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%)119.2Jonathan Neudorf-0.6 mph (-0.5%)-4.712squal -8.281s96.7%qual 94.2%
20 rule changes (B-Spec: 10, F5: 6, SRF3: 3, SM: 1)7 suspension & brakes · 3 cars added · 3 induction · 2 engine · 1 tyres & wheels · 1 weight · 1 wording · 2 othershowhide
  • F5 Intake Boots Correction #33028induction
  • B-Spec Request new Mazda Rear Swaybar #32769suspension & brakes
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • F5 Clarify stepped exhaust header references #32743engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • B-Spec Request to Remove Part Numbers from Kia/Hyundai Spec Lines #32378induction
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • B-Spec Request spring attachment #31351suspension & brakes
  • B-Spec Limit Rear Camber to 1.75 Degrees Section 9.1.10.E.35 #31393suspension & brakes
  • B-Spec Letter 31442 Part# Correction #32060wording
  • F5 E&O class name #32194other
  • B-Spec Request to Classify 2020-21 Versa S #30759cars added
  • B-Spec Request to Classify the Toyota IA sedan & Scion IA Sedan for 2022 #31045cars added
  • B-Spec Mazda 2 Undertray #31442suspension & brakes
  • B-Spec Request to add 2007-2008 Honda Fit #30853cars added
  • F5 Data Box Mounting Plate #31638other
  • SRF3 Three Updates to SRF Rules #31523weight
  • B-Spec Rules Clarification of Body and Camber Plates #30814suspension & brakes
Indianapolis Motor Speedway Runoffs 20212021-09-252:03.121John Phillips · fastest of 60 · top 5 within 1.2s-0.045s (-0.04%)2:03.971Steve Introne · fastest of 60 · top 5 within 0.4s-0.079s (-0.06%)111.2David Oliveira1:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)144.4James Weida-20.831squal -20.502s83.2%qual 83.3%1:49.520Franklin Futrelle · fastest of 84 · top 5 within 0.5s-0.304s (-0.28%)1:50.095John Black · fastest of 82 · top 5 within 0.2s+0.313s (+0.29%)132.1Matthew Horst-13.876squal -13.601s88.8%qual 89.0%1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%)1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%)119.8Kyle Greenhill-5.134squal -5.426s95.9%qual 95.6%
32 rule changes (B-Spec: 22, F5: 3, SRF3: 6, SM: 1)7 suspension & brakes · 4 induction · 4 tyres & wheels · 3 engine · 3 weight · 2 cars added · 3 wording · 6 othershowhide
  • B-Spec Rules Clarification of Body and Camber Plates #30814suspension & brakes
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • B-Spec B-Spec Mazda2 Header Update #30884weight
  • B-Spec Transmission Cooler Requests #30079other
  • B-Spec Request to classify the 07 Honda Fit #30083cars added
  • B-Spec Request Ford Fiesta Eibach Rear Sway Bar Part Number 35143.320 #30340suspension & brakes
  • B-Spec Restrictor rule #30474induction
  • B-Spec Rear wipers on all cars #30585other
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • SRF3 SRF3 Alternator Pulley #30684weight
  • B-Spec Allow 4 lug hub conversion to R60 and R61 MINI #29863suspension & brakes
  • B-Spec Mazda2 header replacement #29944weight +50 lbs
  • B-Spec Honda Fit Years on Spec Line #30078other
  • B-Spec Hyundai/Kia restrictor size incorrect #30380induction
  • B-Spec Clarify tire compound in rules #30387tyres & wheels
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • B-Spec Spec Tire Recommendation #29480tyres & wheels
  • B-Spec Make restrictor thickness unique for B Spec #30349induction
  • SRF3 Mandatory identification: #30223engine
  • B-Spec Request to Classify Hyundai Accent (RB) 2012-2019 #29484cars added
  • B-Spec Countryman production years incorrect #29864other
  • B-Spec Toyota Yaris Model Year Corrections #29896wording
  • B-Spec Correction spec lines for ride height Mini Cooper all models #29952suspension & brakes
  • B-Spec Request to Allow Removal of Stock Brake Dust Shields #29981suspension & brakes
  • B-Spec Request to allow OBX header and restrictor to R55 Clubman 08-10 #30024induction
  • B-Spec Request clarification of B14 shock package for any and all cars #29483suspension & brakes
  • B-Spec Cleanup of spec lines #29495wording
  • SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
Road America Runoffs 20202020-10-022:52.033David Daughtery · fastest of 25 · top 5 within 1.9s2:52.847Riley Salyer · fastest of 25 · top 5 within 0.8s111.5Robert Iversen2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis-31.456squal -31.079s81.8%qual 81.9%2:29.786TJ Acker · fastest of 59 · top 5 within 0.5s2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s131.9Charles Russell Turner-21.809squal -22.247s87.4%qual 87.1%2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill-9.099squal -9.824s94.7%qual 94.3%
32 rule changes (B-Spec: 17, F5: 6, SRF3: 7, SM: 2)6 suspension & brakes · 4 cars added · 3 engine · 3 induction · 3 weight · 1 tyres & wheels · 5 wording · 7 othershowhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • SM Radiator E&O Clarifications #29294engine
  • B-Spec Allowance Versus Requirement for R56 Mini Cooper #29127induction
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • B-Spec Request to change units on wheelbase for consistency with wording #28786wording
  • SRF3 SRF Shocks #28791suspension & brakes
  • B-Spec Transmission cooler for automatic equipped cars #28171weight
  • B-Spec Spring Update for all models #28384suspension & brakes
  • B-Spec Request to Cleanup Sunroof Wording #28401wording
  • B-Spec B-Spec Balance of Performance based on 2018 and 2019 seasons #28394weight -25 lbs
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • B-Spec Request for Model Years Updating #27850other
  • B-Spec Request to classify Min Cooper models #27861cars added
  • B-Spec remove fog lights #27947wording
  • B-Spec add sonic sedan #27948cars added
  • B-Spec Request for Automatic Transmission Inclusion #27686other
  • B-Spec Request to Add Transmission Coolers to Automatics #27687wording
  • B-Spec Add Yaris Sedan #26797cars added
  • B-Spec Add 2011-2016 Fiesta Sedan #26798cars added
  • B-Spec add 2015-2019 Kia Rio #26799other
  • B-Spec Error and Omissions #27858induction
  • F5 Change 600cc restrictor size #27883induction
  • SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • B-Spec Request for Correction of Production Years for Mini Cooper #27226wording
  • SRF3 SRF Tire Warmer Rule #27622tyres & wheels
  • SRF3 SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF3 SRF / SRF3 Majors & Regional Class Updates #27723other
Virginia International Raceway Runoffs 20192019-10-052:22.368Frank Schwartz · fastest of 26 · top 5 within 0.8s2:22.094David Daughtery · fastest of 24 · top 5 within 0.8s112.2John Phillips1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee-24.522squal -25.007s82.7%qual 82.4%2:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s132.4Bobby Sak-17.339squal -17.744s87.8%qual 87.5%2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago-5.635squal -7.816s96.0%qual 94.5%
16 rule changes (B-Spec: 8, F5: 1, SRF3: 3, SM: 4)2 cars added · 2 weight · 1 engine · 1 suspension & brakes · 1 tyres & wheels · 5 wording · 4 othershowhide
  • B-Spec Request for Corrections to 9.1.10 E Item #27 D and E #27224wording
  • B-Spec Remove wording in the B-spec rules #27388wording
  • B-Spec Request to add 2013 Honda Fit model year #27491other
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • B-Spec Request to allow OBX Header for 2007-10 Mini Cooper #26977other
  • SRF3 SRF Dash Windscreen Kit #27028other
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
  • B-Spec Request to add B-Spec to GCR 9.3.26 fuel cell #26132wording
  • SM Request to allow aftermarket fuel filters. #26370wording
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • SM Strike Tire Tread Language #26123tyres & wheels
  • B-Spec Request to classify Canadian Nissan Micra Cup cars #25216cars added
  • B-Spec Request updated Toyota Yaris Spec Lines #25483cars added
  • B-Spec Update wording of exhaust #26022wording
Sonoma Raceway Runoffs 20182018-10-101:59.321Oscar Jackson · fastest of 14 · top 5 within 1.2s1:59.852Jake Pipal · fastest of 12 · top 5 within 1.0s101.0Frank Schwartz1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham-17.361squal -17.514s85.5%qual 85.3%1:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s110.2Steve Fogg-12.799squal -13.204s89.3%qual 88.9%1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn-4.574squal -4.966s96.2%qual 95.8%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-252:03.166David Daughtery · fastest of 18 · top 5 within 2.5s2:04.050David Daughtery · fastest of 18 · top 5 within 2.3s1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s-21.190squal -20.030s82.9%qual 83.7%1:49.824John Black · fastest of 101 · top 5 within 0.5s1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s-14.268squal -13.342s88.5%qual 89.2%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s-4.950squal -4.860s96.0%qual 96.1%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:46.865David Daughtery · fastest of 10 · top 5 within 1.0s1:46.930John Heinricy · fastest of 9 · top 5 within 0.6s1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s-17.077squal -18.337s84.0%qual 82.8%1:34.363John Black · fastest of 41 · top 5 within 0.5s1:34.947Cliff White · fastest of 39 · top 5 within 0.3s-11.983squal -12.502s88.8%qual 88.3%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s-6.166squal -6.351s94.2%qual 94.1%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:29.366John Heinricy · fastest of 15 · top 5 within 1.2s2:29.465John Heinricy · fastest of 15 · top 5 within 0.4s2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s-26.167squal -27.542s82.5%qual 81.6%2:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s-19.250squal -20.809s87.1%qual 86.1%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s-5.398squal -10.705s96.4%qual 92.8%

By track

TrackEvents Typical % of B-Spec Best Latest 
Road America4100.0%100.0%Runoffs 2020100.0%Runoffs 2026
Virginia International Raceway3100.0%100.0%Runoffs 2019100.0%Runoffs 2023
Indianapolis Motor Speedway2100.0%100.0%Runoffs 2017100.0%Runoffs 2021
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Sonoma Raceway1100.0%100.0%Runoffs 2018100.0%Runoffs 2018
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of B-Spec's best on the same day: the weather and the day cancel out, so one figure compares across years where lap times cannot; a class that suits one track more than another still reads differently there. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.