...when you have different front and rear tire sizes? A rear-sized tire on the front will interfere, and a front-sized tire on the rear will make your limited-slip diff unhappy. How far can you drive a limited-slip with different diameter tires? Okay, that depends on the difference, but what's the best choice for a spare?
Spare, what's a spare: whistling
AKA aside, my toy cars have empty trunks, no flat tires in them that I can remember now
My truck, car trailer (it has three spares) and daily drivers have them:
I have had many 15 inch trailer tires fail on the road with my enclosed 24 Ft car trailer
I hate 15 inch trailer tires
the trailer weighs 8600 Lbs. with the old pump gas(heavy) Duster in it hook up to my truck, the tires are rated at 2800 Lbs. each
My next enclosed car trailer will have 16 inch rims and tires
I accidently hit a rock in the dark with the passenger side trailer tires once and took both the rims and tires out, hence 3 spares now