speed relationship between wheel and bike

tonylai

New Member
May 9, 2021
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Hello everyone, I am a student from Taiwan and I am wondering:
1.How to convert the wheel speed(rad/s or RPM) to the e-bike(two wheel drive) speed(m/s or km/hr)?
2.Is there any formula or equation that can represent the relationship between wheel speed(rad/s or RPM) and e-bike(two wheel drive) speed(m/s or km/hr)?
3.I had saw a formula : v=(n*60*L)/1000 where v is e-bike speed, n is wheel's rpm and L is the perimeter of the wheel. Can this formula used for two wheel drive e-bike?

PS:Assume that two wheel's speed are synchronous.
thanks for your answer!!
 
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Sidewinder Jerry

Well-Known Member
Dec 19, 2011
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Here's my speed formula for miles per hour.

(Engine rpm × wheel diameter × ⚻)÷(total reduction × 1056) = speed mph

Example

(7000 × 26 × ⚻) ÷ (18.75 × 1056) = 28.9 mph
 
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