So i ran over some glass the other say, and im thinking about switching the tire that got the flat (P235/7oR15 radial belted sport) for the spare that came with the car when i bought my 91 blazer s10 (michellin P235/7or15 radial 4wx) The spare seems to be a little bigger than the tires I have on there. Should I replace the tire or would it be ok driving around with that one on instead? Thanks.

 

you'll be fine. Same size tires.

One word of caution. How old is that spare? Tires are only good for about 5 years. The rubber deteriates over time, watch fro cracking on teh side wall. If you see cracking, replace the tire. It is no longer safe. Tread gives you traction, the sidewall supports the vehicle and absorbs teh bumps in the road.