Hobby Action RC Raceway rules
21.5 Locked Timing 4WD Rules
v1Class Rules21.5 Locked Timing 4WDEffective Aug 8, 2026· Updated 3 months ago
Summary of recent changes
Published.
Spec sheet
Governing
- Governing body
- ROAR
- Notes
- No sponsorship; ROAR width/weight rules
Motor & ESC
- Motor type
- Spec brushless
- Motor turn
- 21.5T
- Spec motor
- LRP X22 Stock Spec 540 (LRP520213)
- Blinky mode
- fixed
- Max motor timing
- 30° (fixed)
Battery & power
- Battery chemistry
- LiPo
- Cells
- 2S
Chassis & Suspension
- Chassis
- Any 1/10 4WD buggy
1.Car
Any 1/10-scale 4WD buggy.
2.Motor
LRP X22 Stock Spec 540 Sensored Brushless Motor (LRP520213), 21.5T, 30° fixed timing — the only allowed motor.
3.Battery
2S LiPo.
4.Width & weight
ROAR rules on width and weight.
5.Sponsorship
No sponsorship of any kind.
Version history
v1Published.
Aug 15, 2026