thanks, I'll run something less than that. but i still need to know about the rear wheel. i can't run the skinny back tire or wheel. I might be better off if i removed both original wheels, tubes, and tires with less than 100 miles on them and sell, donate, or trade them. i want to purchase a new rear wheel. it doesn't even need to be a seven speed. a single speed to get me home (would it be a two speed because of the pedal derailer) if/when the battery is used up. thanks, david