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BoP Lab / Classes / FRI

FRI vs 1D vs SMSE vs P pace at every track

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
vs1D×ASB-SpecEPFAFCFE2FFFPFRI×FVFXGT1GT2GTXHPvsP×P2SMvsSMSE×SMXSRF3STLSTUT1T2T3T4Show 48 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow
2:012:022:037 rule changes between Runoffs 2015 and Runoffs 20257 ▾1 rule change between Runoffs 2025 and Runoffs 20261 ▾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)Daytona International Speedway · Runoffs 2015Runoffs2015Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
FRI1DSMSEPsolid race · dashed qualifying · slower is lower
EventFRI1DSMSEP
Qual best Race best Trap Qual best Race best Trap vs FRI Qual best Race best Trap vs FRI Qual best Race best Trap vs FRI 
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%)
1 rule change (P: 1)1 suspension & brakesshowhide
  • 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
7 rule changes (P: 7)2 induction · 2 weight · 1 engine · 1 tyres & wheels · 1 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
Daytona International Speedway Runoffs 20152015-09-21

By track

TrackEvents 
Road America2
Daytona International Speedway1
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.