23/11/2003
It's a scenario many drivers dread: a sudden thud, a lurching sensation, and the unnerving pull of a deflating tyre. You're miles from anywhere, perhaps on a dark, wet evening, and the realisation dawns that you might have a puncture. For generations, the immediate thought was to retrieve the trusty spare wheel from the boot. However, in the modern automotive landscape, this might be a luxury your car no longer offers. Increasingly, manufacturers are opting for tyre repair kits over traditional spare wheels, citing space-saving, weight reduction, and improved fuel economy as key benefits. But is this shift truly for the better? Let's delve into the world of spare wheels versus tyre repair kits and explore what you really need to keep you moving.
The Decline of the Spare Wheel
Once a standard fixture in virtually every vehicle, the conventional spare wheel is becoming a rarity. According to tyre manufacturer Continental, the average driver experiences a puncture every 44,000 miles, meaning many motorists may never have encountered a flat tyre or, consequently, realised their car's spare wheel status. Over the last decade, a significant trend has emerged: car makers are phasing out full-size spare wheels, and even their smaller 'space-saver' cousins, in favour of compact tyre repair kits. This move is driven by several factors, primarily the desire to optimise vehicle design and efficiency.
Why the Change?
The primary reasons cited by manufacturers for this transition are:
- Space Efficiency: Tyre repair kits are considerably smaller and lighter than even a compact spare wheel, allowing for more flexible interior packaging and boot space.
- Weight Reduction: Less weight in the vehicle contributes directly to improved fuel economy, a crucial factor in meeting ever-tightening emissions regulations and consumer demands for greener motoring.
- Cost Savings: This is a significant, albeit less publicly promoted, driver. A tyre repair kit typically costs manufacturers around £20, whereas a space-saver spare wheel can cost upwards of £100. By making spare wheels an optional extra, manufacturers can generate additional profit while offering a lower starting price for their vehicles.
What's Actually in New Cars Today?
A comprehensive survey of new car models revealed a striking shift in standard equipment. Out of 251 new car models from 31 different brands examined, a mere 8% were found to come with a full-size spare wheel as standard. Space-saver spares were standard on 30% of models, while a substantial 55% were equipped with tyre repair kits instead of any form of spare wheel. The remaining vehicles were fitted with run-flat tyres, which are designed to be driven on for a limited distance after a puncture.
Here's a general breakdown:
| Tyre Provision | Percentage of New Cars (Approx.) |
|---|---|
| Full-Size Spare Wheel | 8% |
| Space-Saver Spare Wheel | 30% |
| Tyre Repair Kit | 55% |
| Run-Flat Tyres | 7% (remainder) |
The Case for the Spare Wheel
While the trend is clear, 'What Car?' advocates for the continued inclusion, or at least the option, of a spare wheel. Even a space-saver spare offers a significant advantage: it can get you to a place of repair, avoiding the potentially costly and inconvenient process of having your vehicle towed if a tyre repair kit proves insufficient for the puncture.
Understanding Space-Saver Spares
Space-saver wheels, also known as temporary-use spares or 'skinny spares', are designed with specific limitations. They are significantly narrower than your standard road wheels and tyres. It's crucial to understand their operating restrictions:
- Temporary Use Only: These wheels are not intended for long-term use. They are a means to an end – getting you to a garage or tyre specialist for a proper repair or replacement of your original tyre.
- Speed and Distance Limits: While there isn't a fixed maximum distance, the tyre's construction – often with limited tread depth (around 3mm from new) and a softer rubber compound – necessitates caution. Maximum speeds are typically restricted to 50mph for safety reasons. Exceeding these limits can compromise the tyre's integrity and your safety.
- Handling Differences: Fitting a narrower tyre will alter your car's handling characteristics. You'll need to be more mindful of steering and braking, as the grip and stability will not be the same as with your regular wheels.
- Axle Restrictions: For safety, some manufacturers may restrict the use of space-saver spares to either the front or rear axle only. This is to prevent interference with braking systems or potential damage to the drivetrain. Always consult your car's handbook or labels on the spare wheel itself for specific guidance.
- Tyre Matching: Legally, tyres on the same axle must be of the same size and aspect ratio. The aspect ratio refers to the height of the tyre's sidewall as a percentage of its width. While a space-saver is an exception for emergency use, fitting mismatched tyres on other occasions can lead to an MOT failure.
Tyre Repair Kits: The Modern Alternative
Tyre repair kits, often referred to as 'goo kits' or 'inflation kits', typically consist of a sealant and a compressor. The sealant is injected into the tyre, aiming to plug the puncture, and the compressor is used to inflate the tyre back to a safe pressure. While convenient and space-saving, their effectiveness can be limited:
- Puncture Size: Most kits are designed for smaller punctures, typically in the tread area. Larger gashes, sidewall damage, or blowouts are usually beyond the repair capabilities of these kits.
- Temporary Fix: Even if the sealant works, it's often considered a temporary solution. It's crucial to have the tyre professionally inspected and repaired or replaced as soon as possible.
- Cleanliness: The sealant can make a mess inside the tyre, potentially complicating a permanent repair later and sometimes rendering the tyre unrepairable if it contaminates the internal structure too much.
Towing and Spare Wheels
If you're towing a caravan or trailer and experience a puncture on your car, the general advice is that fitting a space-saver spare to any axle of the car is usually permissible. However, as always, it's wise to check your vehicle's handbook for any specific recommendations. Crucially, when towing with a space-saver fitted, you must drive directly to a tyre specialist. Attempting a long journey in this configuration, especially with a load, significantly increases risk.
Do You Need a Spare Wheel?
The decision of whether you need a spare wheel ultimately depends on your driving habits, the types of roads you frequent, and your personal risk tolerance.
Consider These Factors:
- Location: If you often drive in rural areas, on unlit roads, or far from immediate assistance, a spare wheel provides greater peace of mind.
- Frequency of Travel: For those who cover significant mileage, the probability of encountering a puncture increases.
- Convenience: While tyre kits are compact, a spare wheel offers a more robust and often quicker solution in many puncture scenarios, provided you know how to change it.
- Cost vs. Risk: Weigh the cost of an optional spare wheel against the potential cost and inconvenience of being stranded or needing a tow.
The MOT Test
It's worth noting that your car will fail its MOT test if mismatched tyres are fitted, with the exception of temporary-use spare wheels fitted in an emergency. This highlights the importance of maintaining the correct tyre specifications for your vehicle.
Conclusion
The automotive industry's move away from spare wheels is driven by efficiency and cost. While tyre repair kits and run-flat tyres offer solutions for minor punctures and can aid fuel economy, they don't entirely replace the reliability and versatility of a traditional spare wheel, even a space-saver. If you have the option, fitting a spare wheel, whether full-size or space-saver, is generally a worthwhile investment for the added security and convenience it offers when faced with the inevitable reality of a flat tyre.
Frequently Asked Questions
Q1: Can I use a tyre repair kit on any puncture?
No, tyre repair kits are typically only effective for smaller punctures in the tread area. Sidewall damage or large gashes usually cannot be repaired with these kits.
Q2: How fast can I drive on a space-saver spare wheel?
Generally, the speed is restricted to 50mph for safety reasons. Always check the specific limitations for your space-saver spare.
Q3: Will a space-saver spare affect my car's handling?
Yes, due to its narrower width and different construction, a space-saver spare will alter your car's handling. Drive with extra caution.
Q4: Is it legal to drive with a tyre repair kit sealant in my tyre permanently?
While the sealant provides a temporary fix, it's strongly recommended to have the tyre professionally inspected and repaired or replaced as soon as possible. Some permanent repairs may be complicated by the sealant.
Q5: Should I buy a spare wheel if my car only comes with a repair kit?
If you frequently drive in remote areas or value the added security, it's often a good idea to purchase an optional spare wheel if available.
If you want to read more articles similar to Spare Wheels vs. Repair Kits: What's Best?, you can visit the Tyres category.