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GT12 (On-Road) · RC LINK

The Thunderdome rules

GT12 (On-Road)

v1

Class RulesGT12Effective Sep 2, 2025· Updated 1 month ago

Summary of recent changes

Official ThunderDome rulebook (rev 2025-09-02). Discipline: On-Road.

Spec sheet

Governing

Notes: 3mm min ride height; 172mm max width; SXT Black sauce only

Motor & ESC

Motor type: Spec brushless
Motor turn: 21.5T
Spec motor: Gravity RC USGT spec 21.5
ESC: Blinky / zero-timing (ROAR)
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

1.Chassis Spec

Any 1/12th on-road 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.

Min weight: 750 g
Body: GT12 body with body-specific wing

Chassis & Suspension

Chassis: Any 1/12 on-road

6.Motor Spec

Gravity RC USGT spec 21.5 red end bell engraved with T, or Gravity RC USGT spec 21.5 black end bell.

7.Body Spec

12th scale GT12 body with body specific wing.

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.