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NEW QUESTION -- The rim of my spare is a 10.5" while my other 4 rims are 12.5". Thus I have a 33x12.5x15 sitting on a 10.5 rim.


Wha?

I'd be more concerned that a 33x12.5" tire on a 12" rim is a terrible combination than the other tire on a 10" rim...

I think 33x12'5's are perfect on an 8" rim personally.... you can air 'em down to 10 PSI without burping on rocks and sand...... 6 psi on bottomless snow if you want.