Spare tire

Spare tire

A spare tire or spare tyre (or stepney) is an additional tire (or tyre – see spelling differences) carried in a motor vehicle as a replacement for one that goes flat, a blowout, or other emergency. Spare tire is generally a misnomer, as almost all vehicles actually carry an entire wheel with a tire mounted on it as a spare, as fitting a tire to a wheel would require a motorist to carry additional, specialized equipment.