The wife purchased me a StingRay for Christmas. I am assuming all these have the wide rear tires. The chain is rubbing on the tire and the guy that built it said that is normal. Well I road it and it shave the side wall down to the threads. Returned it the guy she purchased it from and he said he adjusted it. It is still on the tire and feel I will continue to have problems. Is it normal for the chain to rub the tire or am I getting the run around. I am mechanically inclined and I don't think this is correct. Can post pictures if need be. Thanks!!