a thick rubber ring, often filled with air, that is fitted around the outer edge of the wheel of a vehicle, allowing the vehicle to stick to the road surface and to travel over the ground more easily

I've got a flat tyre (= the air has gone out of it). 我的车胎没气了。

He was driving along the motorway when his tyre burst. 他正在高速公路上行驶时，突然轮胎爆了。

I keep a spare tyre in the back of the car. 我的车后有个备用轮胎。