Please look at the USGT rule book here, these rules override anything below
Chassis: Any 1/10 scale touring car, 2WD or 4WD.
Motor: 21.5 Brushless - ROAR approved motors only.
ESC: Must have no timing or non-timing profile. "Blinky" mode - ROAR Stock approved ESC's only.
Battery: 2S 7.6V Lipo - hard case only.
Body: Any 190mm or 200mm realistic GT body w/kit lexan or any plastic wing (no oversized racing wings). No Touring Car or Truck bodies.
Tires: Gravity RIE24025 treaded/mounted tires only
Minimum Weight: 1380g