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BoP Lab / Classes / CTC

CTC vs CTB vs SSM vs ITA pace at every track

Lap times across years say as much about the weather as the class. % of CTC is each class's best lap as a share of CTC'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-SpecvsCTB×CTC×EPF600FAFCFE2FFFPFVFXGT1GT2GTXHPvsITA×PP2SMSMXSRF3vsSSM×STLSTUT1T2T3T4Show 166 inactive classes
Reference · what % is measured against
Tracks · untick to narrow
1:301:401:502:002:103 rule changes between Majors @ Pacific Raceway and SARRC 20203 ▾12 rule changes between SARRC 2020 and Palm Tree Winter 202612 ▾1 rule change between Palm Tree Winter 2026 and Majors Apr 20261 ▾CTC race best at Majors @ Pacific Raceway: 1:47.167 (William Hendrickson)CTC qualifying best at Majors @ Pacific Raceway: 1:48.686 (William Hendrickson)CTB race best at Majors @ Pacific Raceway: 1:38.292 (Greg Fordahl)SSM race best at Majors Apr 2016: 1:29.237 (Kevin Kopp)SSM qualifying best at Majors Apr 2016: 1:31.569 (Alan Olson)ITA race best at SARRC 2020: 1:46.072 (Donald Squirek)ITA race best at Majors Apr 2026: 2:11.606 (Abmed Shmara)ITA race best at Southeast 2026: 1:51.273 (Steffen Clark)ITA race best at Southeast SARRC 2026: 1:27.922 (Roger Heaton)ITA qualifying best at Majors Apr 2016: 1:30.560 (Don Wiseman)ITA qualifying best at SARRC 2020: 1:45.443 (Donald Squirek)Hallett Motor Racing Circuit · Majors Apr 2016Majors Apr2016Summit Point Raceway · Majors Apr 2016Majors Apr2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Thunderhill Raceway Park · Majors Apr 2026Majors Apr2026Carolina Motorsports Park · Southeast 2026Southeast2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
CTCCTBSSMITAsolid race · dashed qualifying · slower is lower
92%94%96%98%100%3 rule changes between Majors @ Pacific Raceway and SARRC 20203 ▾12 rule changes between SARRC 2020 and Palm Tree Winter 202612 ▾1 rule change between Palm Tree Winter 2026 and Majors Apr 20261 ▾CTC race best at Majors @ Pacific Raceway: 100.0% of CTC's (William Hendrickson)CTC qualifying best at Majors @ Pacific Raceway: 100.0% of CTC's (William Hendrickson)CTB race best at Majors @ Pacific Raceway: 91.7% of CTC's (Greg Fordahl)Hallett Motor Racing Circuit · Majors Apr 2016Majors Apr2016Summit Point Raceway · Majors Apr 2016Majors Apr2016Pacific Raceways · Majors @ Pacific RacewayMajors @ Pacific Raceway2016Michelin Raceway Road Atlanta · SARRC 2020SARRC2020Homestead-Miami Speedway · Palm Tree Winter 2026Palm Tree Winter2026Thunderhill Raceway Park · Majors Apr 2026Majors Apr2026Carolina Motorsports Park · Southeast 2026Southeast2026Roebling Road · Southeast SARRC 2026Southeast SARRC2026
CTCCTBSSMITAsolid race · dashed qualifying · each class's best lap as a share of CTC's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventCTCCTBSSMITA
Qual best Race best Trap Qual best Race best Trap vs CTC % of CTC Qual best Race best Trap vs CTC % of CTC Qual best Race best Trap vs CTC % of CTC 
Roebling Road Southeast SARRC 2026results only2026-06-271:27.922Roger Heaton · only car
No rule changes on record between these events
Carolina Motorsports Park Southeast 2026results only2026-05-231:51.273Steffen Clark · fastest of 2
No rule changes on record between these events
Thunderhill Raceway Park Majors Apr 2026results only2026-04-252:11.606Abmed Shmara · fastest of 8 · top 5 within 1.4s
1 rule change (ITA: 1)1 inductionshowhide
  • ITA E&O: Turbo Cars in IT #39691induction
Homestead-Miami Speedway Palm Tree Winter 2026results only2026-01-02
12 rule changes (ITA: 12)7 cars added · 1 engine · 1 weight · 1 wording · 2 othershowhide
  • ITA Change 90-93 Miata Diff Housing Upgrade Wording in Notes #38965wording
  • ITA Allow NA Miata to Upgrade to NB Miata Rear Suspension Uprights #38478other
  • ITA 1998-2002 Honda Accord 2.3L #38075cars added
  • ITA 90-93 Miatas to use 94-97 Differential Allowance In #35989other
  • ITA Battery Change #35854weight
  • ITA Request to Classify Chevrolet Beretta #35163cars added
  • ITA Spec LIne Error #33130cars added
  • ITA Request for Porsche 924S Reclassification to ITA #32441cars added
  • ITA Request to Move 83-88 Porsche 944 to ITA #30376cars added
  • ITA Request 2nd Generation Camry to ITB #30007cars added
  • ITA Request to clarify ITA Civic Si 92-95 #28868engine
  • ITA Request to classify a 2003 Honda Accord #28898cars added
Michelin Raceway Road Atlanta SARRC 20202020-07-251:45.443Donald Squirek · fastest of 3 · top 3 within 7.5s1:46.072Donald Squirek · fastest of 3 · top 3 within 6.9s110.4Donald Squirek
3 rule changes (ITA: 3)1 induction · 1 tyres & wheels · 1 weightshowhide
  • ITA Cleanup 4.f Traction control #28609tyres & wheels
  • ITA Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITA Request clarification on 9.1.3 D1.A.2 #26237induction
Pacific Raceways Majors @ Pacific Raceway2016-05-281:48.686William Hendrickson · only car1:47.167William Hendrickson · only car1:38.292Greg Fordahl · only car-8.875s91.7%
No rule changes on record between these events
Summit Point Raceway Majors Apr 20162016-04-291:31.569Alan Olson · fastest of 26 · top 5 within 1.9s1:29.237Kevin Kopp · fastest of 27 · top 5 within 0.3s
No rule changes on record between these events
Hallett Motor Racing Circuit Majors Apr 20162016-04-091:30.560Don Wiseman · only car

By track

TrackEvents Typical % of CTC Best Latest 
Carolina Motorsports Park10 of 1 with CTC
Hallett Motor Racing Circuit10 of 1 with CTC
Homestead-Miami Speedway10 of 1 with CTC
Michelin Raceway Road Atlanta10 of 1 with CTC
Pacific Raceways1100.0%100.0%Majors @ Pacific Raceway100.0%Majors @ Pacific Raceway
Roebling Road10 of 1 with CTC
Summit Point Raceway10 of 1 with CTC
Thunderhill Raceway Park10 of 1 with CTC
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 CTC'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.