How much Torque does a motor need to run a bike with a 110-120 LB person on it?

Vera

New member
I am planning a science fair project and my project is to construct a motorbike (Yes i know they already exist but please bear with me).

I am looking for a motor that has enough torque to propel a bike and a person (110-120lbs) a good speed.

So i guess my question is: What kind of motor can i use/find that will do what i want it do do and won't "Break the bank" so to speak.
It also has to beable to be attached to the bike without any major intergral changes. So it can't be HUGE...
 
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