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A spare tyre is an additional tyre, normally mounted on a wheel, that can temporarily replace a punctured or damaged road wheel.

In everyday use the terms are often used interchangeably. Technically, a spare wheel usually consists of both the wheel rim and the tyre already fitted to it.

A space-saver is a smaller and lighter temporary spare designed to take up less storage space. It normally has stricter speed and distance limitations than a normal road wheel.

No. Temporary spare wheels are intended for emergency use. Follow the maximum speed, distance and other restrictions specified by the vehicle or tyre manufacturer.

No. Many modern cars instead use a tyre-repair kit, run-flat tyres or roadside-assistance arrangements.

For some punctures, yes. A repair kit may temporarily seal a small puncture, but it may not work for severe tyre damage, sidewall damage or a damaged wheel rim.

Yes. A spare tyre can lose pressure while stored for long periods. Check it periodically according to the manufacturer's recommended pressure.

No. The wheel dimensions, bolt pattern, load capacity and other specifications must be compatible with the vehicle. Use only a spare approved or specified for the vehicle.

Drive cautiously, respect any temporary-wheel restrictions and have the damaged tyre repaired or replaced as soon as reasonably possible.

This depends on the country and vehicle category. Some jurisdictions require particular breakdown equipment, while others allow vehicles to operate without a spare wheel.