Feature: 1. ACCURATE AND POWER: This RC brushed motor allows for accurate and maximum energy conversion, while the balanced rotor enhances reliability and maximum speed. 2. HIGH EFFICIENCY: The motor features high purity copper windings for improved efficiency, and the high strength magnets provide stable motor performance. 3. FINE VEHICLE STARTUP: When torque needs exceed speed, the motor reduces speed and efficiently distributes power, preventing vehicle shaking and stalling during startup. 4. EASY INSTALLATION: With its convenient mounting and disassembly, the 1/5 reduction gearbox offers outstanding protection for the motor body and increases high torque output. 5. LOW FRICTION LOW NOISE: Constructed with premium materials, including sealed bearings and cooling fans, this motor offers powerful performance with minimal friction and low noise. Specification: Item Type: 550 motor Material: Iron, copper Weight: Approx. 435g / 15.3oz Motor Voltage: 7.4-12V Motor Length(without shaft): 57mm / 2.2in Motor Diameter: 36mm / 1.4in Motor Shaft Diameter: 3.175mm / 0.13in Motor Shaft Length: 16mm / 0.6in Gearbox Reduction Ratio: 1:5 Gearbox Diameter: 36mm / 1.4in Gearbox Length: 54mm / 2.1in Gearbox Shaft Length: 11mm / 0.4in Gearbox Shaft Diameter: 5mm / 0.2in 15T Gear Diameter: 8.3mm / 0.3in 15T Gear Length: 10mm / 0.4in 15T Gear Hole Diameter: 3.175mm / 0.13in Fitment: Fit for 1/14 1/10 RC crawler DIY . Package List: 1 x 550 Motor1 x Reduction Gearbox2 x Wire1 x Gear6 x Screw4 x Nut2 x RC Small Screw3 x Installation Accessory