Base chassis equipped with 8500KV motor in W-MM specification. The EVO chassis set is perfect for stepping up from the ready set. [Technical data] Overall length: 123.5mm, Overall width: 70~76mm, Overall height: 35mm, Motor mount: MM, Wheelbase 98.0mm (LL), Tread F: 61.5~65.0mm/R: 61.5~65.0mm, Tires (F /R) φ25×8.5mm (sold separately)/φ25×8.5-11mm (sold separately), Gear ratio 7.3, 6.3, 5.5, 4.9:1, Total weight: 135g, Motor: KYOSHO SPEED HOUSE / XSPEED 85 (KV8500). [Required items before driving] Receiver unit, transmitters from various manufacturers that are compatible with the receiver unit, Auto Scale Collection (body set, wheels, tires), 4 AAA alkaline batteries or nickel-metal hydride batteries for driving, and batteries for the transmitter. *Batteries are required to drive this product, but running batteries, transmitter batteries, chargers, etc. are not included. Also, the body, tires, wheels, transmitter, RC mechanism, etc. are not included. Additional parts purchase, assembly, and painting are required before driving. *This product does not use fuel. This product does not contain fuel. *This product does not include paint, adhesive, oil, or grease.