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ITS vs BSpc vs P pace at every track

Class · click a class to switch, + to compare alongside (up to 4)
AS+B-Spec+vsBSpc×EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+ITS×vsP×P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+Show 49 inactive classes
Series
Reference · what % is measured against, 2 events
Tracks · untick to narrow
2:012:022:032 rule changes between Runoffs 2025 and Runoffs 20262 ▾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
ITSBSpcPsolid race · dashed qualifying · slower is lower
EventITSBSpcP
Qual best Race best Trap Qual best Race best Trap vs ITS Qual best Race best Trap vs ITS 
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%)
2 rule changes (ITS: 1, P: 1)1 induction · 1 suspension & brakesshowhide
  • ITS 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
27 earlier rule changes on record, in force before Runoffs 2025 (from 2019)8 cars added · 7 weight · 4 induction · 2 tyres & wheels · 1 engine · 5 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
  • ITS Add 2009 Mini Cooper S #38112weight
  • P Add missing punctuation marks #38150weight
  • ITS Combine ITS RX8 Spec Lines #37382other
  • ITS Combine RX8 Spec Lines in ITR #37383other
  • P Correct text in engine table notes #37606engine
  • P Update Prototype class designation #37653tyres & wheels
  • ITS 90-93 Integra ITS Classing Request #37197cars added
  • ITS Add Spec Miata to ITS #36256weight
  • ITS NC ITS correction (E&O) #36373weight +140 lbs
  • ITS Update Spec Line for MX-5 NC #35968other
  • ITS Battery Change #35854weight
  • ITS Request to classify BMW 325XIT #33889cars added
  • ITS Request T4 allowance directly in ITS #34044cars added
  • ITS Spec LIne Error #33130cars added
  • ITS Request for Porsche 924S Reclassification to ITA #32441cars added
  • ITS Request BMW 323it and 325it car classification #28990cars added
  • ITS Eliminate #30946induction
  • ITS Request to Move 83-88 Porsche 944 to ITA #30376cars added
  • ITS Request to classify a 2003 Honda Accord #28898cars added
  • ITS Cleanup 4.f Traction control #28609tyres & wheels
  • ITS Request OEM hardtops for IT #28272other
  • ITS Request clarification 1999 Ford Escort ZX2 S?R #26966weight -45 lbs
  • ITS Request clarification on 9.1.3 D1.A.2 #26237induction

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.