2024 RCHRA TOP SPORTSMAN CLASS RULES (as of: July 2, 2024)   Chassis: Any scale R/C Car, Truck or Motorcycle Allowed. Rear Tires: CAN NOT LOOK LIKE A BIG DAWG REAR TIRE PREP - EVERYTHING ELSE... SEND IT! - Conditioners and tire rubs are OK... - AS LONG AS IT DOES NOT LOOK LIKE A BIG DAWG REAR TIRE PREP  (THE GLAZED DOUGHNUT LOOK) Any Battery / Any Gas / Any Nitro All tires must be Rubber. ET Bracket Racing / .500 (Full Tree) / Porta Tree Timing System Racer Picks His / Her Dial-In.