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BoP Lab / Classes / 1D

1D vs SMSE vs SMX pace at every track

Lap times across years say as much about the weather as the class. % of 1D is each class's best lap as a share of 1D'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)
1D×AS+B-Spec+EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+P+P2+SM+vsSMSE×vsSMX×SRF3+STL+STU+T1+T2+T3+T4+Show 49 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow
2:102:202:302:404 rule changes between Runoffs 2023 and Runoffs 20244 ▾5 rule changes between Runoffs 2024 and Runoffs 20255 ▾2 rule changes between Runoffs 2025 and Runoffs 20262 ▾SMX race best at Runoffs 2023: 2:12.616 (Noah Harmon)SMX race best at Runoffs 2024: 2:36.278 (Ethan Jacobs)SMX race best at Runoffs 2025: 2:37.091 (Michael Tinis)SMX race best at Runoffs 2026: 2:36.414 (Cam Ebben)SMX qualifying best at Runoffs 2023: 2:11.435 (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 2:35.651 (Ethan Lampe)SMX qualifying best at Runoffs 2025: 2:36.232 (Cam Ebben)SMX qualifying best at Runoffs 2026: 2:36.472 (Skyler Cottrell)Daytona International Speedway · Runoffs 2015Runoffs2015Virginia International Raceway · Runoffs 2023Runoffs2023Road America · Runoffs 2024Runoffs2024Road America · Runoffs 2025Runoffs2025Road America · Runoffs 2026Runoffs2026
1DSMSESMXsolid race · dashed qualifying · slower is lower
Event1DSMSESMX
Qual best Race best Trap Qual best Race best Trap vs 1D % of 1D Qual best Race best Trap vs 1D % of 1D 
Road America Runoffs 20262026-09-282:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)128.4Christian Hoagland-0.6 mph (-0.5%)
2 rule changes (SMX: 2)1 wording · 1 othershowhide
  • SMX Rear Toe Link #40271other
  • SMX Part Number Change Request #39914wording
Road America Runoffs 20252025-09-292:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)129.1Camden Gruber-0.4 mph (-0.3%)
5 rule changes (SMX: 5)1 tyres & wheels · 1 wording · 3 othershowhide
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s129.5Michael Borden
4 rule changes (SMX: 4)1 engine · 1 suspension & brakes · 1 wording · 1 othershowhide
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
Virginia International Raceway Runoffs 20232023-09-232:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s127.8Noah Harmon
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-21

By track

TrackEvents Typical % of 1D Best Latest 
Road America30 of 3 with 1D
Daytona International Speedway10 of 1 with 1D
Virginia International Raceway10 of 1 with 1D
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 1D'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.