I ride my specialized rockhopper exclusively in the city (...I know but it is too late now) The bike is already quiet heavy (fenders, back rack, u-lock) so I am afride that the armies will turn it into a tank. I am already the slowest kid on the block. I don't mind it as much. I dont get too many flats but I need protection just in case and also I want the ride as easy as possible. What do you recommend? Is there other options?