Re: friction kit tire wear
I think in most cases it really comes down to the type of tire you use. My stock cheap bike tires on an $80 bike lasted a couple hundred miles while my Kenda brand tires have last so far 2,500 miles with a frame mount kit. I would like to believe a friction mount kit would divide that in half because you have double the rubbing on the tires between the ground and the friction drive itself, but I can't say I have experienced it personally. Tires would still last quite a bit, just not as long as a normal chain drive.