4 Rocks rules
13.5 Late Model Rules
v1Class Rules13.5 Late ModelEffective Oct 16, 2026· Updated 7 days ago
Summary of recent changes
Winter Rumble classes and rules (Oct 2026).
Spec sheet
Governing
- Notes
- Max LR 3°, max RR 0°.
Motor & ESC
- Motor type
- spec
- Motor turn
- 13.5T
- ESC
- Blinky, 160 A limit
- Blinky mode
- zero_blinky
Battery & power
- Battery chemistry
- LiPo
- Cells
- 2S
- Max voltage
- 8.44V
- Hard case
- Required
Tires
- Spec tire
- Quasi Speed
Weight & body
- Body
- 1-inch spoiler max
1.Body
1-inch spoiler max.
2.Alignment
Max LR camber 3°, max RR camber 0°.
3.Motor & ESC
ROAR-approved 13.5 motor. ESC in blinky, 160 A ESC limit. Epoxy 13.5 motors are allowed at all events (one-year grace period; ROAR drops them for 2027).
4.Battery
2-cell hard-case LiPo, 8.44V max.
5.Tires
Quasi Speed.
6.General
Tech table in place for events. Tire prep is allowed.