SPOKES for e-bikes


This calculator allows to estimate what should be the minimum drive parameters to obtain the assumed speed and range of electric bike.
Speed:  km/h
Range at one battery charging:  km
Total weight of vehicle:  kg - more information
Nominal voltage of drive:  V
SUGGESTION: The indicated nominal voltage of drive may turn out to be too low to obtain the assumed speed km/h, thus we recommend to apply nominal voltage from: V
Other travel parameters are set for typical electric bike, that is: Rolling resistance: 0.013; Aerodynamics coefficient: 0.9; Face surface: 0.46m2

Suggested minimum parameters of drive:

Engine power:  W
Energy accumulated in battery:  Wh
Battery capacity  Ah - more information
If you have already estimated what should be the parameters of the drive you are interested in, you may try to search for it in our drive catalog

Comments - 12

2018-08-23 05:38:06
Below simulator algorithm:

Air resistance = 0.5 * 1.226 * Aerodynamics coefficient * Face surface * ( Speed ) up to third;

Rolling resistance on flat = Weight * Rolling coefficient * Acceleration of the earth
* Speed;

Rolling resistance on a hill = ( Weight * cos(tan(Angle of a hill
/ 100)) * (Rolling coefficient + tan(tan(Angle of a hill / 100))) ) * Acceleration of the earth * Speed ));
Dibakar Deb
2018-08-01 12:38:42
Can you share the calculations?
2018-05-06 08:03:41
Can you mention the formulas for all of the above calculations please
2018-05-06 06:44:57
Dear Bartek,

Can you please share with me the formula/algo for calculating power required for an ebike taking into account rolling friction and air resistance please

2017-12-21 17:48:07
Will you please tell me the formula of these calculations..i will b very thankful to you.
2017-09-26 12:24:58
When I using 250 watt bldc motor ., but I wish the maximum speed is 45km/h. What can I do. Please answer
2017-05-18 09:17:15
Dear Ricky

Here you have calculation to reach 140km/h:

I think you need engine with a motor rated at a minimum of 20kW
Exact calculations are complex. In the comments under the simulator you have an exact formula for calculating rolling and air resistance.
2017-05-17 10:07:02
Dear Bartek

How to calculate the Power of the motor?

As i am planning to increase the speed of the motorcycle to 80 to 140kmph.

So kindly explain how to calculate.
2017-04-20 08:32:56
Roman Van Loo

This calculator does not matter the size of the wheel.
Smaller wheel - lower speed - lower power required
2017-04-20 08:31:08


Watt hr / km - This parameter is shown in the simulator in the lower window.

In free time I will try to update the calculator so that the coefficients of resistance can be changed and to show the energy consumption wh / km

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