Hi all, I managed to salvage a spare tire from a car we cut up for the fire department. It is a Sport King Steel Radial A/T, and it looks like a pretty decent tire, along with good reviews I've found online. I just noticed today that it is a 31x10.5x15 tire. I know that spares should be the same circumference as your regular tire, but I figured that if I am only using this spare less than 50 miles to just get home if I blow a tire, it would be ok (Since I have 265/75/16 KM2's). My only question: If I ever have to use it, is it bad to have a different size wheel than your other 3 tires? My research about this issue has only yielded questions about different size tires, not wheels, so I need some more help. I have 16'' TX Pro wheels by the way.
Any help would be appreciated,