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BoP Lab / Classes / ITB

ITB vs SMSE vs P pace at every track

Class · click a class to switch, + to compare alongside (up to 4)
AS+B-Spec+EP+F600+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+ITB×vsP×P2+SM+vsSMSE×SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 168 inactive classes
Series
Reference · what % is measured against, 2 events
Tracks · untick to narrow
2:012:022:033 rule changes between Runoffs 2025 and Runoffs 20263 ▾P race best at Runoffs 2025: 2:02.122 (Bart Wolf)P race best at Runoffs 2026: 2:03.283 (Lawrence Loshak)P qualifying best at Runoffs 2025: 2:01.180 (Lee Alexander)P qualifying best at Runoffs 2026: 2:02.281 (Perry Richardson)Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
ITBSMSEPsolid race · dashed qualifying · slower is lower
EventITBSMSEP
Qual best Race best Trap Qual best Race best Trap vs ITB Qual best Race best Trap vs ITB 
Road America Runoffs 20262026-09-282:02.281Perry Richardson · fastest of 10 · top 5 within 1.3s+1.101s (+0.91%)2:03.283Lawrence Loshak · fastest of 10 · top 5 within 0.8s+1.161s (+0.95%)165.6Jason Miller+0.7 mph (+0.4%)
3 rule changes (ITB: 2, P: 1)1 cars added · 1 induction · 1 suspension & brakesshowhide
  • ITB 1996-2000 Honda Civic (CX, DX, VP, LX) D16Y7 #40321cars added
  • ITB E&O: Turbo Cars in IT #39691induction
  • P Request to Continue to Allow Carbon Brakes #39476suspension & brakes
Road America Runoffs 20252025-09-292:01.180Lee Alexander · fastest of 14 · top 5 within 1.5s2:02.122Bart Wolf · fastest of 13 · top 5 within 2.1s165.0Jason Miller
17 earlier rule changes on record, in force before Runoffs 2025 (from 2019)5 weight · 4 cars added · 3 induction · 2 tyres & wheels · 1 engine · 2 othershowhide
  • P 13B Rotary Engine Rules Change Request #38856induction
  • P Add Radical Cup series Radical SR3 spec line to Table 1 #38916other
  • P Clarify spec line cars language #38943weight
  • P RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929induction
  • P Add missing punctuation marks #38150weight
  • P Correct text in engine table notes #37606engine
  • P Update Prototype class designation #37653tyres & wheels
  • ITB Battery Change #35854weight
  • ITB Honda Fit 2016 - 2020 Request #34907cars added
  • ITB Request 2nd Generation Camry to ITB #30007cars added
  • ITB Request for Car Eligibility #30070other
  • ITB Request to classify a 2003 Honda Accord #28898cars added
  • ITB Cleanup 4.f Traction control #28609tyres & wheels
  • ITB Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITB Request to allow 07-11 Mini in ITB as BPSEC configuration #26997weight
  • ITB Request clarification on 9.1.3 D1.A.2 #26237induction
  • ITB Request to Dual-Class Honda Fit and B-Spec Cars Into ITC and #25347cars added

By track

TrackEvents 
Road America2
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.