Grrrr.... Yesterday I picked up a screw dead center in the rear tire. I plugged it and it is holding air but now I'm spooked. The tire has about 7000 miles and it looks like it could go another 5000. What do you all think? But a new tire or just ride it? And If I need to buy a new tire, what should I replace it with. I have no problems with the stock 200 one on there now.