DnK
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E-Bikes fall into two categories they either have the motor built into the wheel front / back or they have a mid drive where the motor drives the front chain wheel. For climbing hills the mid drive one is better as it uses the gears on the back wheel. Bosch seem to be the leader at the moment probably because they were first in. The mid drive is not the cheapest and has more to go wrong but certainly performs better.
I have just built two. Started with two fold up bikes and added the motors and batteries. For anyone with a few spanners its not rocket science and you finish up with a smart bike that can be ridden even if the power fails.
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One of the other points about the DIY kit route is you can change bikes and just keep the motors etc. The one in the picture is from my mountain bike. New bike weighed 11.5Kg the motor and battery add about 7kg
Thanks for this info, now i'm going to build two myself. Have read loads today about the conversions and equipment to use and have settled for the Befang BBS01B however can't decide on battery. Whats the details of the one you got from Germany?