http://i34.photobucket.com/albums/d106/89accord/7affeaa9.jpg
pedal for a while and charges battery up to 13.7 volts :) u get a work out 2

I was going to do that with a lawnmower engine. how did you hook up a serpentine belt to your chain sprockets?

How often do you need to charge your car battery?

why not just buy a battery charger and go to the gym while you wait?

i just put my chain over the pulley, and id rather like save alota money than go 2 the gym and buy a charger

uhhh....chain over the pulley is just going to slip and go nowhere no matter how tight you tighten it... greasy metal on metal does not equal friction.

LOL you can't get a complete workout from just bicyling.