The Thunderdome rules
RJ Speed Retro Racing – Breakout (Oval)
v1Class RulesRJ Speed Retro RacingEffective Jul 13, 2026· Updated 3 months ago
Summary of recent changes
Official ThunderDome rulebook (rev 2026-07-13). Discipline: Oval.
Spec sheet
Governing
- Notes
- Breakout racing (3.80s); 3mm min ride height; any battery/ESC/servo/motor/gearing; SXT Black tire sauce only
Motor & ESC
- Motor type
- Open
- Motor turn
- Modified / open
- ESC
- Open
Tires
- Spec tire
- Open rubber or foam
- Tire additive
- Spec sauce only
Weight & body
- Body
- RJ Speed bodies
Chassis & Suspension
- Chassis
- RJ Speed Legends / Spec Modified / Classic Sportsman
1.Chassis Spec
RJ Speed Legends (#2010 / #2011 / #2012) / RJ Speed Spec Modified (#2014) / RJ Speed Classic Sportsman Racer (#2017).
2.Tire and Wheel Spec
OPEN Rubber or Foam.
3.Body Spec
RJ Speed bodies for specific chassis.
4.Ride Height Spec
3mm minimum.
5.Breakout Time
3.80 seconds (any lap faster than the set time will not count).
6.Miscellaneous
Any battery / ESC / servo mounted anywhere on chassis, any turnbuckles, motor, gearing. Anything goes besides specific chassis and bodies — it's breakout racing, just have some fun in cool looking RETRO rides.
7.Race Spec
2-4 minute heats / 60-75 lap mains.
8.Tire Sauce
SXT Black ONLY.