Yes, a space-saver spare tyre is legal to drive on in the UK, but only as a temporary measure. Most manufacturers set a limit of 50mph and around 50 to 70 miles, just enough to reach a garage or arrange a mobile fitter. It is not designed for motorway cruising or long journeys. Only around 3% of new UK cars are sold with a full-size spare, so most drivers will encounter this at some point. Mobile Tyres Co can fit a proper replacement at your home or roadside, 24/7. Call 07982 378 899.
What a Space-Saver Spare Actually Is
A space-saver is a compact, narrower temporary tyre, usually fitted to a smaller wheel than your standard tyres, designed purely to get you off the road safely and to a fitter, not to be driven on for any length of time.
Because of its narrower profile and lighter construction, it behaves differently to a standard tyre under braking and cornering. That difference is exactly why strict limits exist around speed and distance.
Quick Fact: Just 3% of new cars sold in the UK now come with a full-size spare wheel. The other 97% are fitted with either a space-saver, a tyre repair kit, or run-flat tyres as standard.
The Legal Speed Limit on a Space-Saver
There is no single UK-wide legal speed limit written into road traffic law specifically for space-saver tyres. Instead, the limit comes from the manufacturer’s guidance, printed on the tyre’s sidewall and in the vehicle handbook.
Safety First: Almost all manufacturers set a maximum of 50mph. Exceeding this significantly increases the risk of the tyre overheating and failing, since it is not built to the same specification as your standard tyres.
Driving dangerously fast on a space-saver, if it causes an accident, can still result in prosecution for careless or dangerous driving, even though there is no space-saver-specific speed law.
How Far You Can Actually Drive on One
Most manufacturers set a mileage limit of 50 to 70 miles, though this varies by vehicle and should always be checked against your specific handbook.
This limit exists because:
- The space-saver’s smaller diameter changes the car’s handling balance slightly
- Extended use accelerates wear on the space-saver itself, which is not designed for daily driving
- It can affect systems like ABS and traction control, which are calibrated for your standard tyre size
The mileage limit is a guide to get you to a garage or arrange a mobile fitter, not a target to use up before replacing the damaged tyre.
What You Should Never Do on a Space-Saver
- Never use it on the motorway at motorway speeds. Most manufacturers advise avoiding motorways altogether where possible, given the 50mph limit sits well below motorway traffic flow
- Never fit two space-savers to the same axle. A space-saver should only ever be used one at a time
- Never ignore a TPMS warning light after fitting a space-saver, since tyre pressure monitoring systems can behave differently with a temporary wheel fitted
- Never treat it as a long-term fix. It is designed for days, not weeks
What To Do Once You’re on a Space-Saver
- Reduce your speed immediately to below the manufacturer’s stated limit, usually 50mph
- Avoid harsh braking and sharp cornering, since the space-saver has less grip than a standard tyre
- Check your handbook for the exact speed and mileage limit for your specific vehicle
- Book a replacement as soon as possible, ideally the same day, rather than continuing to drive on the space-saver
- Have the damaged tyre assessed to see whether it can be repaired under the BSAU159 standard or needs replacing entirely
Space-Saver vs Tyre Repair Kit vs Run-Flat
Not every car carries a space-saver. Many now come with either a repair kit or run-flat tyres instead, and each has different rules.
- Space-saver: A physical spare wheel, limited to roughly 50mph and 50 to 70 miles
- Tyre repair kit: A sealant and inflator, only usable on smaller punctures and not on sidewall damage or larger holes
- Run-flat tyres: No spare needed, but a run-flat driven flat still has a limit, typically around 50mph and 50 miles, before it needs replacing rather than repairing
Important: A repair kit cannot fix a puncture larger than the BSAU159 repairable limit of 6mm, and it does nothing for sidewall damage. In either case, a mobile fitter is the faster route back on the road than trying to nurse the car to a garage.
FAQs
Is it illegal to drive on a space-saver tyre?
No, it is legal, but only as a temporary measure. Manufacturers set limits, typically around 50mph and 50 to 70 miles, and exceeding them significantly increases the risk of tyre failure.
Can I drive on a space-saver on the motorway?
Most manufacturers advise avoiding motorways where possible, since the 50mph limit sits well below normal motorway traffic speed, making it both slower and riskier than staying on A-roads.
How long can I leave a space-saver fitted?
It is designed for days, not weeks. The mileage limit, usually 50 to 70 miles, is meant to get you to a fitter, not to be used up gradually over an extended period.
Do all new cars come with a space-saver?
No. Only around 3% of new UK cars are sold with a full-size spare, and many now use a tyre repair kit or run-flat tyres instead of any spare wheel at all.
Can a mobile fitter come to me while I’m on a space-saver?
Yes. Mobile Tyres Co can fit a replacement tyre at your home, workplace or roadside, meaning you only need to drive on the space-saver for as short a distance as possible.
What if my puncture is repairable rather than needing a full replacement?
A mobile fitter can assess this on-site. Punctures up to 6mm in the tread area under the BSAU159 standard can often be repaired rather than replaced, saving the cost of a new tyre.