I recently upgraded from 15x8 rims with 225/70/15s to 16x8 rims with 235/70/16s. According to the handy-dandy tire size calculator
, that means that my new tire/wheel combo is 1.6 inches bigger in diameter than the old one (29 in vs 27.4 in).
Does this mean I can't use the old spare? I imagine not, but I'd love to avoid having to purchase (or beg, borrow, steal, or trade for) a bigger spare.
Or am I OK if I treat it like a donut (<50MPH, no more than 30 miles)?