Motor Features - High efficiency (>90%) - New design with lighter weight but bigger torque - Higher power than the competition, faster acceleration and highter top speed - NMB precision ball bearings ensure longer life - Neodymium agnets ensure high power output Motor Specifications Model: XERUN 4068SD KV2250 Sensored Brushless Motor Rotational Speed: 2250 KV Motor Dimensions (Diameter x Length): 40.8mm x 68.4mm Shaft Dimensions (Diameter x Length): 5mm x 18.5mm Input Battery Types: NiCd/ Nimh/ Li-po Battery Recommend Model: RC Model 1/8 Car