tyre, tread

tyre British English ; tire American English[countable]

a thick rubber ring that fits around the wheel of a car, bicycle etc:

I had a flat tyre (=all the air went out of it) on the way home.

The spare tyre 's in the boot.

front/rear/back tyre

a punctured front tyre

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.