Key takeaways
- A full-size spare matches your normal wheels and can be driven indefinitely; a space-saver is a smaller, temporary get-you-home wheel.
- Most space-savers carry a speed limit of around 50mph (80km/h) and are meant for limited distance only, usually until you reach a tyre fitter.
- On a 4WD or AWD car, a space-saver should be used with extra care, as its smaller size can stress the drivetrain.
- Many new cars now come with no spare at all, just a sealant repair kit, so check your boot before you need it.
When you get a puncture, what is in your boot makes a big difference to what happens next. Some cars carry a full-size spare, many carry a small space-saver, and a growing number carry only a sealant kit or nothing at all. Knowing which you have, and how to use it safely, turns a roadside emergency into a minor inconvenience. This guide explains the differences clearly.
What is the difference between a spare and a space-saver?
A full-size spare is a normal wheel and tyre matching the others on your car, so once fitted you can drive normally. A space-saver is a narrower, smaller temporary wheel, usually with a distinctive coloured rim, designed only to get you to a tyre fitter. It saves boot space and weight but comes with strict speed and distance limits.
| Feature | Full-size spare | Space-saver |
|---|---|---|
| Size | Matches your other tyres | Narrower and smaller |
| Speed limit | Normal | Typically about 50mph |
| Distance | Unlimited | Short, get-you-home only |
| Handling | Like normal | Reduced grip and braking |
| Boot space | Takes up more room | Compact and light |
How fast and how far can you drive on a space-saver?
Most space-savers carry a speed limit of around 50mph (80km/h) and are intended for a limited distance, usually just enough to reach a tyre fitter rather than to complete a long journey. The exact figures are printed on the tyre sidewall or rim sticker and in your handbook, so always check yours and stick to whatever it states.
Because a space-saver is narrow with less tread on the road, it offers reduced grip and longer braking, and it can affect stability, traction control and ABS. Drive gently, avoid hard cornering and braking, and replace or repair the proper tyre as soon as you can rather than treating the space-saver as a permanent fix.
Are there downsides to a space-saver?
Yes. A space-saver is a compromise: it is light and compact but it handles, grips and brakes worse than a normal wheel, and it cannot be used at speed or for long distances. On four-wheel-drive and all-wheel-drive cars the smaller rolling circumference can also place extra strain on the drivetrain, so use it with particular caution and at low speed.
It is also a single-use safety net. Once you have used your space-saver, you have nothing left if a second tyre fails, which is another reason to get the punctured tyre sorted quickly. If your space-saver is old, check it has enough pressure and is not perished, because it sits unused for years and can quietly go off.
How do you fit a space-saver safely?
Fitting a space-saver follows the same steps as any wheel change, but the key is to do it somewhere safe and then drive gently. Pull well clear of traffic, put on your hi-vis and warning triangle, and only change the wheel if you can do so away from live lanes. On a motorway hard shoulder, it is usually safer to wait behind the barrier for assistance.
Once the space-saver is on, lower the car, tighten the bolts firmly in a diagonal pattern, and check the space-saver pressure, which is often higher than your normal tyres. Drive off slowly, keep within the speed limit marked on the wheel, and head straight to a fitter. For the full method, see our step-by-step guide on how to change a tyre safely.
What if your car has no spare at all?
Many newer cars come with no spare wheel, just a tyre sealant and inflator kit, to save weight and boot space. A repair kit can seal a small tread puncture temporarily, but it cannot fix a sidewall split, a large hole or a tyre that is already flat off the rim, and sealant can make a later professional repair harder.
If you have no usable spare and no working kit, the safest option is to call for help rather than drive on a flat. Our guides on what to do with no spare tyre and using a tyre repair kit cover this in detail, and whether a puncture can be repaired explains the limits of a proper repair.
Punctured and unsure what to do?
Whether you are on a space-saver, stuck with a sealant kit, or have no spare at all, you should not push on with a damaged tyre. Fast Tyre runs a 24/7 emergency callout service across London and central England, bringing a new tyre to your home, work or the roadside, usually within 30 to 60 minutes, so you can get off the space-saver and back to normal driving quickly.
Frequently asked questions
Only with great care and within its speed limit, usually around 50mph, which is below normal motorway speeds. It is far safer to leave the motorway and get the proper tyre repaired or replaced as soon as possible rather than continuing at reduced speed.
A space-saver is a temporary, get-you-home solution, not a permanent wheel. Use it only until you can repair or replace the proper tyre, ideally within a day or two. It offers less grip and braking and is not designed for ongoing daily driving.
Usually yes. Space-savers often require a higher pressure than your normal tyres, frequently around 60psi. The correct figure is printed on the wheel or sidewall and in your handbook, so check it and keep the space-saver inflated so it is ready when needed.
Manufacturers leave out spare wheels to save weight, boot space and cost, which also helps fuel economy and emissions figures. Instead they fit a sealant and inflator kit or run-flat tyres. Always check what your car carries before you rely on having a spare.
For convenience and safety, yes, because a full-size spare can be driven at normal speeds and distances. The downside is that it takes up more boot space and weighs more. A space-saver is a lighter, compact compromise meant only for short, slow trips.