Shengyi powerful DGW25E motor is strong enough to ride on rough mountain trail, which offers stable, smooth and continuous power to support 60NM max torque. Main parameter of DGW25E-Rear Drive Motor-MTB specification parameter Driving position Rear Wheel size 20in-28in Spoke 36holes 12G Rated power 500W (750W customized) Rated voltage 36V~48V Max.torque â?¥60N.m Efficiency â?¥80ï¼? Cable side Left Number of magnet 16 Reduction gear ratio 1:05 Installation dimension 175mm(Cassette&Screw)190mm(Cassette&Screw) Inside speed sensor 1~6 Hall sensor With/Without Free wheel Cassette 9-10s/Screw 6-7s Brake Disc-brake/ V-brake Classification of waterproof IPX5 Weight 4.6Kg Now the price of 500 watt rear hub motor is reasonable, if you have needs, please contact us. As one of electric wheel hub motor manufacturers, we will do our best to meet all the needs of customers.