So i bought an 05 about two months ago and its a great bike. i have a question that i need your guys' oppinion on. the tires (Qualifiers) are fairly new and in good shape, except, the rear tire has a a small hole in the center of the tread that the previous owner had fixed himself with some king of tire repair stuff, it was basically like some kind of rubber that filled the hole. he said he was riding to a town over and when he got to his riends house he noticed the tire was flat, so he got the repair stuff, fixed it and rode it home (like 50 miles), the tire holds air and seems to be alright. do you think the tire is safe. the hole seems to be pretty small like maybe a small nail. i drive the bike every day and it seems alright. what do you think?