This is the 1/10 scale, electric powered, radio controlled, Tamiya TT02R On-Road Chassis Kit. The following Hop Up Option Parts are included; 53159 4mm Aluminum Flange Lock Nut (Blue) 54247 3x18mm Aluminum Turnbuckle Shaft (Blue) x2 54501 TT-02 Aluminum Propeller Shaft 53642 5mm Aluminum Ball Connector (Blue) 54500 TT-02 High-Speed Gear Set (68T) 54502 TT-02 Aluminum Propeller Joint FEATURES: Chassis: ABS resin bathtub type minimizes contact with the road Drive: Four wheel, aluminum shaft driven Motor Mount: Aluminum Differential: Gear type Wheels: Ten spoke, black in color Tires: Slick rubber with foam inserts Ball Bearings: Shielded Suspension: Fully independent double wishbone Shocks: CVA oil-filled Camber: Non-adjustable, camber refers to the angle of the tops of the tires from vertical when viewed from front or behind vehicle Caster: Adjustable, caster/toe-in refers to the angle of the front suspension when viewed from the side of the car in relation to the chassis, newly-designed aluminum uprights provide 3 degrees of toe-in for better stability when cornering Steering: Bellcrank type Bumper: Front, urethane INCLUDES: Tamiya TT0R Chassis, with Tires, Wheels, Shocks, Decals and Instructions REQUIRES: Radio: 2-channel with high speed steering servo Motor: Tamiya Super Stock brushed motor recommended Electronic Speed Control: To match selected motor Battery: 7.2V NiMH Battery Charger: To match selected battery Body: 1/10 scale on-road Paint, building and track equipment SPECS: Length: 14.8" (376mm) Width: 7.2" (182mm) Wheelbase: 10.1" (257mm) COMMENTS: To upgrade to ball bearings order; Qty. Size Location Qty Bearing Set 2 5x11mm Spur Gear 1 DTXC1547 2 5x11mm Driveshaft 1 DTXC1547 2 8x12mm Front Differential 1 DTXC1581 2 8x12mm Rear Differential 1 DTXC1581 2 5x10mm Front Uprights 1 DTXC1535 2 5x10mm Rear Uprights 1 DTXC1535 jxs 04/28/15 ir/jxs