07D675,the only problem i see with running generator from factory is the bushing would burn up. thats why i use a high speed bearing to take the load,so all it has to do is spin and all my bikes that i plan on running it won't probable go over 25mpg(more like 15-20mpg)but i do have to say, i have run across some old bicycle generators and they still work:thumbsup:tuff little units..........