BoP Lab / Classes / SSM

SSM vs BS vs GTX vs SRF3 pace at every track

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ASB-SpecvsBS ×EPFAFCFE2FFFPFVFXGT1GT2vsGTX ×HPPP2SMSMXvsSRF3 ×SSM×STLSTUT1T2T3T4Show 49 inactive classes

Series Runoffs Super Tour Both

Reference · what % is measured against, 12 events

Tracks · untick to narrow Auto Club Speedway Barber Motorsports Park Blackhawk Farms Raceway Buttonwillow Raceway Park Circuit of St. Louis (formerly Gateway Motorsports Circuit of the Americas Daytona International Speedway Grattan Raceway Hallett Motor Racing Circuit Homestead-Miami Speedway Indianapolis Motor Speedway Laguna Seca Michelin Raceway Road Atlanta Mid-Ohio Sports Car Course New Jersey Motorsports Park NOLA Motorsports Park Pacific Raceways Pittsburgh International Race Complex Portland International Raceway Pueblo Motorsports Park Road America Sebring International Raceway Sonoma Raceway Summit Point Raceway Thunderhill Raceway Park Virginia International Raceway Watkins Glen International Willow Springs Raceway World Wide Technology Raceway

SSMBSGTXSRF3solid race · dashed qualifying · slower is lower

	Event	SSM			BS				GTX				SRF3
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs SSM	Qual best	Race best	Trap	vs SSM	Qual best	Race best	Trap	vs SSM
	Road America Runoffs 20262026-09-28												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%)
5 rule changes (GTX: 3, SRF3: 2)2 cars added · 1 removed · 2 othershowhide 2026-04-01 GTX Ferrari 296 GT3 Classification Request #39873cars added 2026-03-01 GTX Remove GT3U from GCR as it is now in STU #39862removed 2026-03-01 SRF3 SRF3 Spark Plugs #39899other 2026-01-01 GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70 #39470cars added 2025-10-01 SRF3 Add HD Oil Cooler #38979other
	Road America Runoffs 20252025-09-29												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%)
6 rule changes (GTX: 3, SRF3: 3)1 aero · 1 cars added · 1 engine · 1 weight · 2 othershowhide 2025-09-01 SRF3 SRF Rule Updates #38853weight 2025-06-01 GTX Ligier P3 LS Swap #38164engine 2025-05-01 GTX Request to Classify Porsche GT2 RS Clubsport #37972cars added 2025-04-01 SRF3 Driver Safety & Comfort #37966other 2025-04-01 SRF3 Update SADEV transmission specs #37992other 2025-01-01 GTX Correct language regarding OEM Areo Devices #37137aero
	Road America Runoffs 20242024-10-01												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%)
16 rule changes (GTX: 6, SRF3: 10)4 weight · 3 suspension & brakes · 3 tyres & wheels · 2 engine · 1 aero · 1 cars added · 2 othershowhide 2024-10-01 SRF3 Update SRF3 Air Filter Rule #36681other 2024-10-01 SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes 2024-10-01 SRF3 Hoosier Tire Decal Placement #36739tyres & wheels 2024-09-01 SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels 2024-08-01 SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels 2024-06-01 SRF3 SRF3 Alternator Pulley Update In #36095weight 2024-05-01 GTX Request for Spec Line 1010 Reconsideration #35009weight +300 lbs 2024-02-01 GTX Rear Blade Spoiler Clarification #35261aero 2024-02-01 GTX GT Direct Injection allowance and rules #35437engine 2024-02-01 GTX GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine 2024-01-01 GTX KTM X Bow GTX #34956cars added 2024-01-01 SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes 2024-01-01 SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes 2024-01-01 SRF3 SRF / SRF3 Rule Updates #35268weight 2023-12-01 GTX Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-10-01 SRF3 SRF Radiator Rule Update #34805other
	Virginia International Raceway Runoffs 20232023-09-23												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%)
8 rule changes (GTX: 4, SRF3: 4)3 cars added · 3 tyres & wheels · 1 induction · 1 suspension & brakesshowhide 2023-07-01 GTX Request Ligier LMP3 Classification #34043cars added 2023-07-01 GTX Ligier JSP4 Request #34173cars added 2023-06-01 SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels 2023-05-01 GTX Please classify Fields Cardinal V8 #33784cars added 2023-05-01 SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels 2023-03-01 SRF3 Update SRF Brake Rule #33469suspension & brakes 2023-03-01 SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels 2022-12-01 GTX GT2 (TA2)/GTA Part Number Update #33315induction
	Virginia International Raceway Runoffs 20222022-09-24												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%)
11 rule changes (GTX: 8, SRF3: 3)4 cars added · 2 suspension & brakes · 2 weight · 1 induction · 1 tyres & wheels · 1 othershowhide 2022-09-01 GTX Tail lights on all GT category race cars. #32799suspension & brakes 2022-06-01 GTX Classify 992 GT3 Cup #32649cars added 2022-06-01 SRF3 SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes 2022-05-01 GTX Add Classification to the accepted Model Table #31981weight 2022-05-01 GTX Request to classify C7 Corvette Grand Sport IN GTX Misc #32254cars added 2022-05-01 GTX E&O list of eligible prototypes #32511other 2022-03-01 GTX McLaren 720s GT3 #31955cars added 2022-02-01 GTX Remove restrictions from GTX-FIA GT3 #32039induction 2021-12-01 SRF3 Three Updates to SRF Rules #31523weight 2021-10-01 GTX Request car classification #31032cars added
	Indianapolis Motor Speedway Runoffs 20212021-09-25												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
10 rule changes (GTX: 4, SRF3: 6)3 cars added · 2 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 1 othershowhide 2021-09-01 GTX Request to classify 2020 Porsche 718 GT4 Clubsport MR #30956cars added 2021-08-01 GTX Request to Update GTA Obsolete Part Numbers #30615wording 2021-08-01 GTX GTX class correction to GT2/ST #30973cars added 2021-08-01 SRF3 SRF Wet Tires #30849tyres & wheels 2021-08-01 SRF3 SADEV-SRF3 Transmission #30926other 2021-08-01 SRF3 SRF Update Maintenance, Repairs and Seals #30961engine 2021-07-01 GTX Request classification of Grullon #30481cars added 2021-06-01 SRF3 SRF3 Alternator Pulley #30684weight 2021-03-01 SRF3 Mandatory identification: #30223engine 2020-12-01 SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
	Road America Runoffs 20202020-10-02												2:29.786TJ Acker · fastest of 59 · top 5 within 0.5s	2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s	131.9Charles Russell Turner
17 rule changes (GTX: 10, SRF3: 7)5 cars added · 4 suspension & brakes · 3 aero · 1 induction · 1 tyres & wheels · 1 weight · 2 othershowhide 2020-09-01 GTX GT Category Wording #29193induction 2020-08-01 GTX Request Car classification #28935cars added 2020-08-01 GTX X-Bow GT4 #29088cars added 2020-07-01 GTX TA2 Gurney flap wicker clarification #28874aero 2020-07-01 GTX STO Gurney flap wicker clarification #28883aero 2020-07-01 GTX GT Gurney flap wicker clarification #28909aero 2020-06-01 GTX Request to Re-classify SP Stock car to GTX #28333cars added 2020-06-01 SRF3 SRF Shocks #28791suspension & brakes 2020-05-01 GTX Request to Classify Lotus Evora GTS #27057cars added 2020-05-01 SRF3 Update Bump Stop Rule #28712suspension & brakes 2020-05-01 SRF3 SRF Bump Stop Correction #27019suspension & brakes 2020-02-01 GTX Windshield Clips #27323other 2020-01-01 GTX Request Factory Five Daytona coupe classification #26308cars added 202-01-01 SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes 2019-12-01 SRF3 SRF Tire Warmer Rule #27622tyres & wheels 2019-12-01 SRF3 SRF / SRF3 Nose Weight Reduction #27706weight 2019-12-01 SRF3 SRF / SRF3 Majors & Regional Class Updates #27723other
	Virginia International Raceway Runoffs 20192019-10-05												2:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s	2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s	132.4Bobby Sak
8 rule changes (GTX: 5, SRF3: 3)2 cars added · 2 suspension & brakes · 1 engine · 3 othershowhide 2019-07-01 SRF3 SRF Dash Windscreen Kit #27028other 2019-05-31 SRF3 New SRF Sectional Nose Rule Addition #26914other 2019-05-01 GTX Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine 2019-05-01 GTX Request to Classify Ligier JS2 R #26535cars added 2019-05-01 SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes 2019-04-01 GTX Request Ride Height Clarification #26600suspension & brakes 2019-03-01 GTX Replace FIA references with SRO #26427other 2019-01-01 GTX GTX Homologation table update #26034cars added
	Sonoma Raceway Runoffs 20182018-10-10												1:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s	1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s	110.2Steve Fogg
No rule changes on record between these events
	Indianapolis Motor Speedway Runoffs 20172017-09-25												1:49.824John Black · fastest of 101 · top 5 within 0.5s	1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s
No rule changes on record between these events
	Mid-Ohio Sports Car Course Runoffs 20162016-09-19												1:34.363John Black · fastest of 41 · top 5 within 0.5s	1:34.947Cliff White · fastest of 39 · top 5 within 0.3s
No rule changes on record between these events
	Daytona International Speedway Runoffs 20152015-09-21												2:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s	2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s

By track

Track	Events
Road America	4
Virginia International Raceway	3
Indianapolis Motor Speedway	2
Daytona International Speedway	1
Mid-Ohio Sports Car Course	1
Sonoma Raceway	1

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 the reference class'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.