Key Features High-Quality Material: All-aluminum housing, pure copper coils and rare earth magnet steel bring it superior corrosion resistance, heat dissipation, 248℉ high-temperature resistance and impact resistance. High Efficiency: It boasts a powerful motor(350W, 330RPM) and high torque(10.85N·m), providing a high efficiency(≥78% efficiency) to control the speed. Brushless Motor: The brushless motor features low friction, low noise, and smooth working. IP33 Protection: The IP33 protection level make the product waterproof and dustproof. Adjustable Speed: The speed can be adjusted to 80%, 100% and 110% of the motor speed, which can be adjusted according to the specific situation during traveling. Reversing Function: The controller provides a reversing connector, and we also provide you with a reversing switch, which makes reversing convenient on the electric bike. Application It is specifically designed for spoke wheels and fits wheels within 27 inches in diameter and rear wheel drums within 1.37 inches in diameter. Specifications Color: Silver, Black Material: Aluminum, Copper, Rare Earth Magnet Steel Speed Gears: Three(80%,100%,110%) Motor Efficiency: ≥78% Rated Voltage: 36V DC Power: 350W Temperature Resistance: 120℃/248℉ Model: MY1016Z3 Suspension Type: Rear Special Feature: Electric Torque: About 10.85N·m Unload Current: ≤2A Unloaded Speed: 3850Rpm Rated Current: 12.5A Rated Speed(Before Speed Reduction):3000RPM Rated Speed(After Speed Reduction): 330RPM Gear Ratio: 9.78:1 Insulation Class: F Protect Grade: IP33 Motor Controller Voltage: 24/36VDC Motor Controller Max Current: 16A Motor Controller Power: 350W Motor Controller Voltage: 1.1-4.2V Under Voltage: 20V Brake: Low Level Suitable Bike Type: Spoke Wheel Bike Suitable Bike Wheel Diameter: ＜68.58cm/27inch Suitable Bicycle Hub Diameter: ＜35mm/1.3inch Assembly Required: Yes Chainwheel Outer Diameter: 134mm/5.27inch Chainwheel Inner Diameter: 35mm/1.38inch Chainwheel Teeth Space: 12.7mm/0.5inch Packaging Size: 26*15*18cm/10.23*5.9*7inch Gross Weight: 4.7kg/10.36lbs Package Included 1*Brushless Motor 1*Controller All Accessories For Assembly Notes 1. Please check the size carefully before ordering. 2. Please note that anti-theft accessories need to be purchased separately 3. Please note that batteries or chargers are not included.