The Thunderdome rules
GT12 Nastruck 17.5 (Oval)
v1Class RulesGT12 NastruckEffective Dec 21, 2025· Updated 3 months ago
Summary of recent changes
Official ThunderDome rulebook (rev 2025-12-21). Discipline: Oval.
Spec sheet
Governing
- Governing body
- ROAR
- Notes
- 172mm max width; 3mm min ride height
Motor & ESC
- Motor type
- Spec brushless
- Motor turn
- 17.5T
- Spec motor
- Any ROAR-approved 17.5
- ESC
- Blinky / zero-timing
- Blinky mode
- zero_blinky
Battery & power
- Battery chemistry
- LiPo
- Cells
- 1S
- Max voltage
- 4.20V
- Hard case
- Required
Tires
- Spec tire
- Any rubber 1/12 scale
- Tire additive
- Spec sauce only
Weight & body
- Min weight
- 750 g
- Body
- SuperRad SR-20 Super TRK12
Chassis & Suspension
- Chassis
- Any 1/12 on-road chassis
1.Chassis Spec
Any 1/12th on-road specific chassis.
2.Weight Spec
Minimum 750g 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 and Wheel Spec
Any rubber 12th scale tire. Sidewall glueing allowed.
6.Motor Spec
Any ROAR approved 17.5.
7.Body Spec
SuperRad SR-20 Super TRK12 1/12th scale oval truck body.
8.Ride Height Spec
3mm minimum.
9.Width Spec
172mm max width.
10.Race Spec
2-4 minute heats / 60-75 lap mains.
11.Tire Sauce
SXT Black ONLY.