The Thunderdome rules
17.5 Stock (Oval)
v1Class Rules17.5 StockEffective Sep 4, 2025· Updated 3 months ago
Summary of recent changes
Official ThunderDome rulebook (rev 2025-09-04). Discipline: Oval.
Spec sheet
Governing
- Governing body
- ROAR
- Notes
- 4mm min ride height; battery max 90F at tech
Motor & ESC
- Motor type
- Spec brushless
- Motor turn
- 17.5T
- Spec motor
- Tekin SPEC-R2 17.5 GEN4
- 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
- World GT foam spec (BSR/CRC/Contact/Excelerate/Jaco)
- Tire additive
- Spec sauce only
Weight & body
- Min weight
- 1020 g
- Body
- Any 1/10 NASCAR Xfinity body
Chassis & Suspension
- Chassis
- Any 1/10 pan car
1.Chassis Spec
Any 1/10th pan car.
2.Weight Spec
Minimum 1020g 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
Approved World GT foam spec tires / BSR / CRC / Contact / Excelerate / Race More RC / Jaco Tires (white rims with purple or blue stripe).
6.Motor Spec
Tekin SPEC-R2 17.5 GEN4 Elite #TT2690E / Tekin SPEC-R2 17.5 GEN4 Pro #TT2690P.
7.Body Spec
Any 1/10th scale NASCAR Xfinity style body.
8.Ride Height Spec
4mm minimum.
9.Race Spec
30 lap qualifiers / 50 lap mains.
10.Tire Sauce
SXT Black ONLY.