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17.5 Sprint (Oval) · RC LINK

The Thunderdome rules

17.5 Sprint (Oval)

v1

Class Rules17.5 SprintEffective Jul 17, 2026· Updated 1 month ago

Summary of recent changes

Official ThunderDome rulebook (rev 2026-07-17). Discipline: Oval.

Spec sheet

Governing

Governing body: ROAR
Notes: 4mm 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: 2S
Max voltage: 8.40V
Hard case: Required

Tires

Spec tire: Any foam
Tire additive: Spec sauce only

1.Chassis Spec

Any 2wd sprint car chassis.

2.Weight Spec

Minimum 1502g 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 2 cell Lipo hard cased. MAX temp 90F at tech table. 8.40 MAX VOLTAGE.

5.Tire and Wheel Spec

Any foam tires.

Weight & body

Min weight: 1502 g
Body: Sprint car body (top wing, front wing, cage, etc.)

Chassis & Suspension

Chassis: Any 2WD sprint car chassis

6.Motor Spec

Any ROAR approved 17.5 motor.

7.Body Spec

Sprint car body must resemble a real sprint car with top wing, front wing (with rounded corners on both wings), hood, tail tank, cage, bumpers, nerf bars, headers and side panels.

8.Ride Height Spec

4mm minimum.

9.Race Spec

2-4 minute heats / 60-75 lap mains.

10.Tire Sauce

SXT Black ONLY.