Riding an electric bike in winter
07/10/2026Crank drive motor kit for electric bike
07/10/2026The 9C RH205 Nine Continent rear motors exist in different windings that determine torque and speed:
Here is a small summary table of RH205 motor windings :
- 6 X 10 = RH205S-180/280 top speed 35 km/h, torque 52 Nm
- 7 X 09 = RH205S-230/320 top speed 41 km/h, torque 46 Nm
- 8 X 08 = RH205S-280/380 top speed 48 km/h, torque 41 Nm
- 9 X 07 = RH205S-330/420 top speed 54 km/h, torque 36 Nm
- 10 X 6 = RH205S-350/480 top speed 58 km/h, torque 30 Nm
Note that an alternative denomination is sometimes used:
2805 = 12×5, 2806 = 10×6, 2807 = 9×7, 2808 = 8×8, 2809 = 7×9, 2810 = 6×10, 2812 = 5×12
With a 9 x 07, cruise speed without wind, at 25° on a 26″ wheel, is between 45 and 50km/h with a fully charged 48V battery.
If you want to use the e-bike on routes with large elevation changes, favour torque.
On the other hand, you may enjoy not going too fast; in that case avoid the 10×6 or 9×7 windings!
Note that the motors accept up to 2000 watts, so you can pair them with high-voltage controllers.
The important thing will be to respect the maximum power using the famous calculation
For example, with a Power-e-bike electric bike motor kit fitted with a 60V nominal 35-amp controller and a 60V nominal battery fully charged at 67.2 V
Battery model: 60V
Nominal capacity (AH): 13AH / 15AH / 20AH
Nominal voltage (V): 60V
Cell source resistance (mΩ): <40 mΩ
Cell specification: powerful 3.7V 18650 3C cell
Cell combination: 5 series 16 parallel / 6 series 16 parallel / 8 series 16 parallel
Number of cells (series x parallel): 80/96/128 pcs
Discharge cut-off voltage (V): 48 +/- 1 V
Charge cut-off voltage (V): 67.2 V
Maximum continuous discharge current (A): 30A
Maximum instant discharge current (A): 50A
Charge mode: CC / CV
Standard charge current (A): 2A
Charge time at standard charge current: 10 hours
Maximum fast charge current (A): 5A
Charge time at fast charge current: 4 hours
Charge temperature range: 0-45 °C
Discharge temperature range: -20-65 °C
The calculation is:
67.2 * 35 * 80/100 = 1881.6 watts max


