It will fit arround 95% of all bikes. If you have a bike with a special construction or there is something unclear, please contact us at email@example.com and tell us, which bike you have or send pictures from the area between the pedals and the rear wheel.
Yes it is no problem when using it without a cellphone.
You can set the speed or power limit (0%, 25%, 50%, 75%, 100%) with buttons that can be mounted on the handle bar. The kit is set to 250W / 25km/h when it is delivered, but we can change this for you (maximal limits are 800W, 45km/h)
This is very subjective to answer. If you ride in a city with some cars around, you will probably hear nothing. If you ride in the nature you can hear it. Try to hear it on the last five seconds from our video where we have tried to capture the sound of the motor.
Basically, we can not grant for any repayments. If the engine does not fits to your bike, we can make an exception. However, we will keep 10% of the donation to compensate the cost of the campaign and Administration and you have to pay for shipping.
Please send us a picture from the area, where the ONwheel should be mounted, so we can declare it before.
Don't see the answer to your question? Ask the project creator directly.