1/10 2WD OFF-ROAD TRUCK SPECS

-All trucks must be 2wd.
-Maximum truck length - 18"
-Maximum truck width - 13"
-Truck wheel base - Minimum - 9" Maximum - 11.5"
-Minimum Truck weight - 2WD - 60 ounces = 3lbs. 12oz.
-Truck wheel diameter - Minimum-mounting bead – 2.175in. Maximum mounting bead 2.25" Maximum overall – 2.46in.
-Wheel mounting - Must be securely mounted at all times.
-Maximum Truck wheel width – 2in.
-Truck tire width - Minimum - 2" Maximum – 2.125in.
-Minimum Truck tire diameter – 3.6in.
-Wheel cut out - Use body cut lines
-Engine - .12 . This year a .15 RTR or 4 stroke .26 is legal. This is an effort to help grow this class due to the drop in interest in 1/10 Trucks. 
-Motor - Brushed or Brushless - Mod or stock.
-Electric Trucks conforming to the rules of this class will be allowed to participate. That means they must meet the minimum weight. Electric trucks must make pit stops during mains. The appropriate number to be determined at each event which will be equal to the number of stops for the largest majority of nitro powered truck. This addition is to help increase interest in the truck class.
-Fuel - Nitro mixtures only. Maximum allowed 75 milliliters/cc for the tank, filter(s) and fuel line from tank to carb.
-Power - NIMH, NICD, Lipo maximum voltage of 7.4v
-Transmission - 1 speed only - viscous or slipper drivers are allowed
-Rear suspension - Independent
-Main events - 5 to 60 Minutes
-Bodies - Off-road Truck
-Tires - Rubber only
-All vehicles must meet the 85db rule for noise.
62: Exhaust pipes are also required on every car. The maximum sound level is 85 decibels, measured at a ninety degree angle to the side of the car from a distance of 30 feet, 3 feet above the ground, with the car at maximum throttle and at all speeds

(Taken from RCPro rules)