The Thunderdome rules
1/12 Super Stock 13.5 Rules
v1Class Rules1/12 Super Stock 13.5Effective Aug 4, 2026· Updated 3 months ago
Summary of recent changes
Updated to latest track rules (revised 2026-08-04).
Spec sheet
Governing
- Notes
- Motor 17.5 or 13.5 ROAR approved with OPEN motor timing; 172mm max width; 3mm min ride height; SXT Black sauce only; battery max 90F at tech.
Motor & ESC
- Motor type
- Spec brushless
- Motor turn
- 13.5T
- ESC
- ROAR Blinky spec software
- Blinky mode
- zero_blinky
Battery & power
- Battery chemistry
- LiPo
- Cells
- 1S
- Max voltage
- 4.20V
- Hard case
- Required
Tires
- Spec tire
- Blue or Purple stripe spec foam
- Tire additive
- Spec sauce only
Weight & body
- Min weight
- 730 g
- Body
- 12th scale wedge body
Chassis & Suspension
- Chassis
- Any 1/12 on-road chassis
1.Chassis Spec
Any 1/12th on-road chassis.
2.Weight Spec
Minimum 730g in race-ready trim.
3.ESC
Any ESC that is ROAR approved and running in ROAR approved "Blinky" spec software.
4.Battery Spec
ROAR approved 1 cell Lipo, hard cased. MAX temp 90F at tech table. 4.20 MAX VOLTAGE.
5.Tire & Wheel Spec
Blue or Purple stripe spec foam tires. Sidewall glueing allowed.
6.Motor Spec
17.5 ROAR approved with open timing / 13.5 ROAR approved with open timing.
7.Body Spec
12th scale wedge type body.
8.Ride Height Spec
3mm minimum.
9.Width Spec
172mm max width.
10.Race Spec
8 minute qualifiers / 8 minute mains.
11.Tire Sauce
SXT Black ONLY.
Version history
v1Published.
Jul 28, 2026