The quick answer
Use a temporary spare only within the specific restrictions printed on it and stated in the vehicle handbook. Check compatibility and condition, and arrange prompt assessment of the damaged tyre. A spare being fitted does not make an unsafe vehicle or roadside location safe.
Identify the spare type
A full-size matching spare, a narrower space-saver and an emergency inflation kit are different provisions. Find out which your vehicle actually carries. Do not assume that a wheel borrowed from another car is compatible just because its bolt holes appear to line up.
Use the vehicle documents to confirm whether the spare is approved for the affected wheel position. Some fitments have axle restrictions or other conditions. If the instructions are unclear, ask a qualified professional or the vehicle manufacturer before use.
Read the restrictions as a set
Michelin explains temporary spare restrictions and handbook guidance. The relevant instructions can cover speed, distance, tyre pressure, wheel position and use. Do not copy another vehicle’s allowance, and do not treat a commonly quoted speed as approval for every spare.
A speed limit is a maximum, not a recommended speed in rain, poor visibility or difficult traffic. Arrange the permanent tyre solution promptly rather than scheduling several days of ordinary journeys around the spare.
Confirm condition and inflation before relying on it
A spare can deteriorate or lose pressure while stored. Check it through the manufacturer’s recommended routine, including any specific pressure setting. Do not assume a stored spare uses the same pressure as the road tyres.
A damaged, unsuitable or uninflated spare is not a backup you can rely on. Keep its condition separate from the question of whether somebody has the equipment to fit it. Both the spare and fitting arrangements have to be suitable.
The working position still matters
Do not attempt a tyre change on a motorway. In other circumstances, fitting needs a safe, permitted position and the correct vehicle-specific equipment and procedure. If those conditions cannot be met, arrange appropriate breakdown assistance or recovery instead of improvising.
This guide covers deciding how to use the spare, not a universal jacking procedure. For an unsafe motorway stop, follow our motorway guidance summary and the official emergency response.
Tell the replacement provider what has changed
If you are now on a spare, say so when enquiring. Give the affected original wheel, its tyre markings if safely available, where the damaged wheel is stored and the current location of the vehicle. Mention locking wheel nut access and any suspected rim damage.
If you have moved after assistance, update the location. A fitter sent to the original breakdown position will not know that a spare enabled you to reach a car park unless somebody tells them.
Finish the job and restore the backup
Once a compatible permanent tyre has been fitted, ask what checks or instructions apply to the wheel assembly. Reinstall or store the spare and equipment according to the vehicle instructions, and include the spare in future maintenance checks.
Fix My Tyre provides mobile tyre replacement. We check the required fitment, availability, price and suitable access before agreeing attendance. We do not provide puncture repairs or locking wheel nut removal, so disclose a missing key before planning the visit.
Common questions
Can I drive normally on a space-saver?
No. Follow its specific temporary-use restrictions and the vehicle handbook.
Is a full-size spare always identical to the road tyres?
No. Check the exact specification, condition and vehicle instructions. A wheel’s physical size alone does not establish compatibility.
Can I change to the spare on a motorway?
Do not attempt repairs or wheel changes on a motorway. Use the official breakdown safety process and arrange assistance.
Sources and further reading
Guidance checked on 11 October 2026. Use the current official instructions for your vehicle and circumstances.