What is the collective wisdom when to replace a spare tire? Covered with Sun cover and obviously no weight on it. I suppose just being exposed to the air causes tire to break down. When does spar...
It's a spare. It's supposed to get you down the road until you can get a flat fixed or a replacement tire. You kept it covered. As long as it's doesn't have any sun damage, dry rot and holds air pretty well, no use buying a new spare. If your really worried and can afford it go ahead and do it, but keep the old spare. A few bucks more and you can get another rim too. Then you'll have two spares like I do.