This is the 1/10 scale electric powered, radio controlled, 2WD RJ Speed Digger Truck Kit. FEATURES: Chassis: Composite fiberglass 3/32" (2.2mm) thick Drive: Rear wheel drive with solid rear axle (no differential) Brass bushings support the rear axle and front wheels Body: Clear untrimmed Lexan Tires: Foam, premounted to six spoke black plastic wheels Front, outer diameter 2.5" (63.5mm), width 1.1" (28.5mm) Rear, outer diameter 2.5" (63.5mm), width 2" (50mm) Spur Gear: 54 tooth, 32 pitch nylon Pinion Gear: 11 tooth steel Steering: Adjustable metal link Servo Saver: Required for steering servo (NOT INCLUDED) - KIMC1014 INCLUDES: RJ Speed Digger Truck Kit, foam wheels, pinion gear, spur gear, clear body and instruction sheet REQUIRES: Radio: 2-Channel with 1 Servo and ESC Radio Batteries: (8) AA size Motor: 540 or 500 size Battery: 6-cell 7.2V stick Charger: AC/DC timed or peak Paint: Lexan safe paint of modeler"s choice Misc. Items: Building and track equipment SPECS: VEHICLE- Length: 12" (305mm) Width: 8.25" (209.5mm) Height: 5.5" (140mm) Wheelbase: 8" (203mm) BODY- Length: 12" (305mm) Width: 7.1" (180mm) Height: 4.25" (108mm) COMMENTS: To upgrade from bushing to ball bearings, order; Qty. Size Qty. Bearing Set 4 1/8 x 5/16" Flanged 2 DTXC1403 2 1/4 x 3/8" Flanged 1 DTXC1433 jxs 5/27/09 ir/jxs