Opening size (mm/OLD) 175. Maximum outer diameter (mm) 158.5. Cable length (mm), wiring type 250 G9.5 / G10.3. Number of magnets (pulses/period) 6. Reduction ratio 1:5. Number of motor poles (2P) 20. Certification ROHS / CE. Corrosion protection class (hour) 96. Mounting position: Rear motor. Wheel diameter (inch) 20/26/700C/28. Rated voltage (DCV) 48. No-load speed (Rpm) 400. Rated power (W) 750 /1000. Load speed (Rpm) 350. Maximum torque 85 N. Efficiency (%)? 80. Color Black / Silver. Weight (kg) 4.9. Operating temperature -20 – 45°C.