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BoP Lab / Classes / FB

FB vs SRF vs FM vs SMX pace at every track

Lap times across years say as much about the weather as the class. % of FB is each class's best lap as a share of FB'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)
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: FB 100.0% of FB J R Osborne, Daytona International Speedway Runoffs 2015 race · SRF 119.0% of FB Thomas Kirchman, Indianapolis Motor Speedway Runoffs 2017 qualifying · FM 100.6% of FB Bryce Cornet, Virginia International Raceway Runoffs 2019 qualifying

1:201:402:002:202:401 rule change between Runoffs 2018 and Runoffs 20191 ▾17 rule changes between Runoffs 2019 and Runoffs 202317 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾FB race best at Runoffs 2015: 1:51.616 (J R Osborne)FB race best at Runoffs 2016: 1:21.015 (Jeremy Hill)FB race best at Runoffs 2017: 1:33.702 (Alex Mayer)FB race best at Runoffs 2018: 1:31.189 (J R Osborne)FB race best at Runoffs 2019: 1:57.688 (Pete Frost)FB qualifying best at Runoffs 2015: 1:50.711 (J R Osborne)FB qualifying best at Runoffs 2016: 1:19.886 (Alex Mayer)FB qualifying best at Runoffs 2017: 1:33.746 (Gary Hickman)FB qualifying best at Runoffs 2018: 1:28.612 (J R Osborne)FB qualifying best at Runoffs 2019: 1:54.469 (Pete Frost)SRF race best at Runoffs 2015: 2:16.700 (Cliff White)SRF race best at Runoffs 2016: 1:37.621 (Todd Harris)SRF race best at Runoffs 2017: 1:53.769 (Todd Harris)SRF qualifying best at Runoffs 2015: 2:14.306 (Cliff White)SRF qualifying best at Runoffs 2016: 1:37.344 (Mike Miserendino)SRF qualifying best at Runoffs 2017: 1:51.573 (Thomas Kirchman)FM race best at Runoffs 2015: 1:58.029 (Joseph Burton-Harris)FM race best at Runoffs 2016: 1:27.922 (Jacob Loomis)FM race best at Runoffs 2017: 1:41.146 (Jarret Voorhies)FM race best at Runoffs 2018: 1:37.909 (Bryce Cornet)FM race best at Runoffs 2019: 2:15.816 (Bryce Cornet)FM qualifying best at Runoffs 2015: 1:57.804 (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 1:26.043 (Jacob Loomis)FM qualifying best at Runoffs 2017: 1:41.231 (Jarret Voorhies)FM qualifying best at Runoffs 2018: 1:37.598 (Bryce Cornet)FM qualifying best at Runoffs 2019: 1:55.124 (Bryce Cornet)SMX race best at Runoffs 2023: 2:12.616 (Noah Harmon)SMX race best at Runoffs 2024: 2:36.278 (Ethan Jacobs)SMX race best at Runoffs 2025: 2:37.091 (Michael Tinis)SMX race best at Runoffs 2026: 2:36.414 (Cam Ebben)SMX qualifying best at Runoffs 2023: 2:11.435 (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 2:35.651 (Ethan Lampe)SMX qualifying best at Runoffs 2025: 2:36.232 (Cam Ebben)SMX qualifying best at Runoffs 2026: 2:36.472 (Skyler Cottrell)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019Virginia International Raceway · Runoffs 2023Runoffs2023Road America · Runoffs 2024Runoffs2024Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FBSRFFMSMXsolid race · dashed qualifying · slower is lower
100%105%110%115%120%1 rule change between Runoffs 2018 and Runoffs 20191 ▾17 rule changes between Runoffs 2019 and Runoffs 202317 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾5 rule changes between Runoffs 2025 and Runoffs 20265 ▾FB race best at Runoffs 2015: 100.0% of FB's (J R Osborne)FB race best at Runoffs 2016: 100.0% of FB's (Jeremy Hill)FB race best at Runoffs 2017: 100.0% of FB's (Alex Mayer)FB race best at Runoffs 2018: 100.0% of FB's (J R Osborne)FB race best at Runoffs 2019: 100.0% of FB's (Pete Frost)FB qualifying best at Runoffs 2015: 100.0% of FB's (J R Osborne)FB qualifying best at Runoffs 2016: 100.0% of FB's (Alex Mayer)FB qualifying best at Runoffs 2017: 100.0% of FB's (Gary Hickman)FB qualifying best at Runoffs 2018: 100.0% of FB's (J R Osborne)FB qualifying best at Runoffs 2019: 100.0% of FB's (Pete Frost)SRF race best at Runoffs 2015: 122.5% of FB's (Cliff White)SRF race best at Runoffs 2016: 120.5% of FB's (Todd Harris)SRF race best at Runoffs 2017: 121.4% of FB's (Todd Harris)SRF qualifying best at Runoffs 2015: 121.3% of FB's (Cliff White)SRF qualifying best at Runoffs 2016: 121.9% of FB's (Mike Miserendino)SRF qualifying best at Runoffs 2017: 119.0% of FB's (Thomas Kirchman)FM race best at Runoffs 2015: 105.7% of FB's (Joseph Burton-Harris)FM race best at Runoffs 2016: 108.5% of FB's (Jacob Loomis)FM race best at Runoffs 2017: 107.9% of FB's (Jarret Voorhies)FM race best at Runoffs 2018: 107.4% of FB's (Bryce Cornet)FM race best at Runoffs 2019: 115.4% of FB's (Bryce Cornet)FM qualifying best at Runoffs 2015: 106.4% of FB's (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 107.7% of FB's (Jacob Loomis)FM qualifying best at Runoffs 2017: 108.0% of FB's (Jarret Voorhies)FM qualifying best at Runoffs 2018: 110.1% of FB's (Bryce Cornet)FM qualifying best at Runoffs 2019: 100.6% of FB's (Bryce Cornet)Daytona International Speedway · Runoffs 2015Runoffs2015Mid-Ohio Sports Car Course · Runoffs 2016Runoffs2016Indianapolis Motor Speedway · Runoffs 2017Runoffs2017Sonoma Raceway · Runoffs 2018Runoffs2018Virginia International Raceway · Runoffs 2019Runoffs2019Virginia International Raceway · Runoffs 2023Runoffs2023Road America · Runoffs 2024Runoffs2024Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FBSRFFMSMXsolid race · dashed qualifying · each class's best lap as a share of FB's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventFBSRFFMSMX
Qual best Race best Trap Qual best Race best Trap vs FB % of FB Qual best Race best Trap vs FB % of FB Qual best Race best Trap vs FB % of FB 
Road America Runoffs 20262026-09-282:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)128.4Christian Hoagland-0.6 mph (-0.5%)
5 rule changes (SRF: 3, SMX: 2)1 suspension & brakes · 1 wording · 3 othershowhide
  • SRF GCR Rain/Brake Light Correction #40579suspension & brakes
  • SMX Rear Toe Link #40271other
  • SMX Part Number Change Request #39914wording
  • SRF SRF3 Spark Plugs #39899other
  • SRF Add HD Oil Cooler #38979other
Road America Runoffs 20252025-09-292:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)129.1Camden Gruber-0.4 mph (-0.3%)
7 rule changes (SRF: 2, SMX: 5)1 tyres & wheels · 1 wording · 5 othershowhide
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
  • SRF Driver Safety & Comfort #37966other
  • SRF Update SADEV transmission specs #37992other
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s129.5Michael Borden
14 rule changes (SRF: 10, SMX: 4)4 suspension & brakes · 3 tyres & wheels · 1 engine · 1 weight · 2 wording · 3 othershowhide
  • SRF Update SRF3 Air Filter Rule #36681other
  • SRF Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF Hoosier Tire Decal Placement #36739tyres & wheels
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
  • SRF Protest Fee Clarification #36540wording
  • SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • SRF Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF SRF / SRF3 Rule Updates #35268weight
  • SRF SRF Radiator Rule Update #34805other
Virginia International Raceway Runoffs 20232023-09-232:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s127.8Noah Harmon
17 rule changes (SRF: 17)5 suspension & brakes · 5 tyres & wheels · 3 weight · 2 engine · 2 othershowhide
  • SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • SRF Update SRF Brake Rule #33469suspension & brakes
  • SRF SRF Tire Rule Update #32614tyres & wheels
  • SRF Brake, seal, and air filter clarifications #32670suspension & brakes
  • SRF Three Updates to SRF Rules #31523weight
  • SRF SRF Wet Tires #30849tyres & wheels
  • SRF SADEV-SRF3 Transmission #30926other
  • SRF SRF Update Maintenance, Repairs and Seals #30961engine
  • SRF SRF3 Alternator Pulley #30684weight
  • SRF Mandatory identification: #30223engine
  • SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes
  • SRF SRF Bump Stop Correction #27019suspension & brakes
  • SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • SRF SRF Tire Warmer Rule #27622tyres & wheels
  • SRF SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF SRF / SRF3 Majors & Regional Class Updates #27723other
Virginia International Raceway Runoffs 20192019-10-051:54.469Pete Frost · only car1:57.688Pete Frost · only car145.9Pete Frost1:55.124Bryce Cornet · fastest of 8 · top 5 within 2.3s2:15.816Bryce Cornet · fastest of 8 · top 5 within 4.9s135.7Bryce Cornet+18.128squal +0.655s115.4%qual 100.6%
1 rule change (SRF: 1)1 othershowhide
  • SRF SRF Dash Windscreen Kit #27028other
Sonoma Raceway Runoffs 20182018-10-101:28.612J R Osborne · fastest of 7 · top 5 within 3.3s1:31.189J R Osborne · fastest of 7 · top 5 within 3.7s140.5J R Osborne1:37.598Bryce Cornet · fastest of 13 · top 5 within 0.9s1:37.909Bryce Cornet · fastest of 12 · top 5 within 1.3s124.1Melvin David Kemper Jr+6.720squal +8.986s107.4%qual 110.1%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:33.746Gary Hickman · fastest of 18 · top 5 within 3.3s1:33.702Alex Mayer · fastest of 17 · top 5 within 3.0s1:51.573Thomas Kirchman · fastest of 50 · top 5 within 2.8s1:53.769Todd Harris · fastest of 45 · top 5 within 0.2s+20.067squal +17.827s121.4%qual 119.0%1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s+7.444squal +7.485s107.9%qual 108.0%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:19.886Alex Mayer · fastest of 10 · top 5 within 1.5s1:21.015Jeremy Hill · fastest of 10 · top 5 within 1.2s1:37.344Mike Miserendino · fastest of 27 · top 5 within 0.8s1:37.621Todd Harris · fastest of 27 · top 5 within 0.6s+16.606squal +17.458s120.5%qual 121.9%1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s+6.907squal +6.157s108.5%qual 107.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:50.711J R Osborne · fastest of 20 · top 5 within 1.1s1:51.616J R Osborne · fastest of 19 · top 5 within 2.1s2:14.306Cliff White · fastest of 39 · top 5 within 1.2s2:16.700Cliff White · fastest of 38 · top 5 within 0.5s+25.084squal +23.595s122.5%qual 121.3%1:57.804Joseph Burton-Harris · fastest of 10 · top 5 within 2.3s1:58.029Joseph Burton-Harris · fastest of 10 · top 5 within 1.7s+6.413squal +7.093s105.7%qual 106.4%

By track

TrackEvents Typical % of FB Best Latest 
Road America30 of 3 with FB
Virginia International Raceway2100.0%1 of 2 with FB100.0%Runoffs 2019100.0%Runoffs 2019
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Indianapolis Motor Speedway1100.0%100.0%Runoffs 2017100.0%Runoffs 2017
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 FB'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.