FEATURES: Lightweight design, the car weighing is 2360g. [Front Mounting] Ideal for motors up to 119 mm in length. [Rear Mounting] Accommodates motors up to 140 mm in length. 48T Spur Gear can usedAluminum Spool Mount #OP-0153Motor Mount: CNC Aluminum, Cam Lock StyleStandard Part #OP-0149 for max.