What the MOT Test Says About Spare Tyres
In the United Kingdom, the requirement for a spare tyre to pass a Ministry of Transport (MOT) test is a common point of confusion for many motorists. The short answer is that a vehicle does not inherently need to carry a spare tyre to pass its MOT inspection. However, the condition and presence of any fitted spare wheel or tyre can be assessed if it is present and deemed to be part of the vehicle's safety equipment.
- A spare tyre is not a mandatory item to pass your MOT.
- If a spare tyre is fitted, it must meet specific safety standards.
- The primary focus is on the roadworthy condition of the tyres currently fitted to the vehicle.
- Spare wheel carriers and their security are also subject to inspection.
The MOT test's primary objective is to ensure vehicles on public roads are safe to drive and comply with environmental standards. This assessment focuses on the tyres that are currently fitted to the vehicle's axles. These tyres must be of the correct size and specification for the vehicle, free from damage such as cuts or bulges, and possess a minimum tread depth of 1.6 millimetres across the central three-quarters of the breadth of the tread. If your vehicle is equipped with a spare tyre, and this spare tyre is not properly secured or is in a condition that would make it unsafe to use in an emergency, it could potentially lead to a test failure. This is not because a spare is mandatory, but because the equipment that *is* present must be safe and correctly fitted.
The Driver and Vehicle Standards Agency (DVSA) provides detailed guidance to MOT testers, which outlines the criteria for vehicle inspection. This guidance prioritises the safety and roadworthiness of the vehicle as it is presented for testing. Therefore, while you won't fail simply because a spare tyre is absent, any tyre present on the vehicle, including a spare if it's mounted externally or within the boot and visible for inspection, must be in good condition. This includes ensuring the spare tyre is correctly inflated and has adequate tread if it's part of the inspection criteria.
Think about it from the tester's perspective: their job is to check the vehicle's current roadworthiness. If a spare wheel and tyre are attached to the vehicle (for example, on a rear carrier or visibly in the boot), it's considered part of the vehicle's equipment. If this equipment is faulty or unsafe – perhaps the spare is flat, has a significant cut, or the mounting is loose – it indicates a potential issue with the vehicle's overall maintenance, even if it's not currently in use. This is why the condition of a fitted spare can matter.
Tyre Condition Requirements During an MOT
When your vehicle is undergoing its MOT, the inspector will meticulously examine the tyres fitted to the wheels that are currently on the car. This scrutiny covers several key areas:
- Tread Depth: As mentioned, a minimum of 1.6mm across the central portion of the tyre is legally required.
- Damage: Any cuts, abrasions, bulges, or tears on the tyre walls or tread that are deep enough to expose the cords will result in a fail.
- Inflation: While not always explicitly tested for pressure, a tyre that is severely under- or over-inflated can affect handling and wear, and might be flagged.
- Size and Type: Tyres must be the correct size and type for the vehicle as specified by the manufacturer. Mismatched tyres on the same axle are also a common failure point.
- Advisories: Even if a tyre doesn't cause an immediate fail, the tester might issue an advisory note if the tread is approaching the minimum limit or if there are minor signs of wear that could become a problem soon.
The rules are designed to ensure that when you drive away, your vehicle is as safe as it can be. A bald tyre or one with a dangerous cut is a clear risk, regardless of whether it's a primary wheel or a spare.
The MOT focuses on the immediate roadworthiness of the vehicle as presented.
What if My Vehicle Has a Spare Tyre Fitted?
What happens if your vehicle is one of the many that come equipped with a spare tyre, whether it's a full-size wheel, a temporary space-saver, or a repair kit? The MOT test inspectors are trained to check the condition and fitment of these items if they are part of the vehicle's standard equipment or are visibly attached. This doesn't mean they inflate the spare and check its pressure, but rather that they ensure it's secure and not damaged in a way that would render it unusable. For instance, a spare tyre that is visibly cracked, has a hole, or is completely deflated might be noted. Similarly, if the spare wheel is mounted externally, the bracketry holding it must be in good condition and securely fastened. A loose or corroded spare wheel carrier could lead to a failure because it represents a potential safety hazard.
The crucial distinction here is that the vehicle is not failing because it *lacks* a spare tyre, but because the *existing* spare tyre equipment is in a state that compromises safety or is improperly secured. This is often a point of confusion; people assume that because the spare tyre is part of the check, it must be present. In reality, it's the condition of the equipment that matters if it's there. So, if you regularly carry a spare tyre, it's good practice to ensure it's properly inflated and in good condition, not just for your own peace of mind during a breakdown, but also to avoid any potential issues during your MOT inspection.
Consider a scenario where a spare tyre is stored under the boot floor. The MOT tester will check that the cover can be opened and closed and that the tyre itself doesn't show obvious signs of severe deterioration. If the spare tyre is mounted on the rear door of an SUV, for example, the condition of the tyre and the security of the mounting bracket will be assessed. A tyre that looks ancient, has perished sidewalls, or a carrier that rattles loosely could be flagged. This is all about ensuring that any safety-related component, even if it's a backup, is in an acceptable state.
Checking Your Spare Tyre Before Your MOT
To preempt any issues, it’s wise to give your spare tyre a quick once-over before heading for your MOT. Here’s what to look for:
- Visual Condition: Check for cracks, bulges, or any signs of perishing on the sidewalls.
- Inflation: Ensure it's not completely flat. While the exact pressure isn't a pass/fail criterion unless critically low, a flat spare is a useless spare.
- Tread Depth: While less critical than on the main wheels, a spare with minimal tread might be noted if it's very worn.
- Security: If externally mounted, check the carrier is robust and the wheel is firmly attached.
A properly maintained spare tyre is an indicator of overall vehicle care.
Inspect your spare tyre's condition and inflation level at least twice a year, especially before your MOT is due, to ensure it's ready for use and compliant.
What About Tyre Repair Kits?
With the increasing prevalence of compact temporary tyre repair kits, often found in place of a full-size spare wheel, it's important to understand how these are viewed during an MOT. Many modern vehicles, particularly smaller cars and electric vehicles, are supplied with a can of sealant and an inflation device or a sealant and a small compressor, rather than a traditional spare tyre. These kits are designed to temporarily seal a puncture, allowing the driver to reach a repair centre or home safely. For the purposes of the MOT test, a tyre repair kit is generally acceptable. The absence of a traditional spare tyre is not a failure point in itself, and therefore, the presence of a repair kit instead of a spare is also not a reason to fail.
The DVSA's guidelines primarily focus on the tyres fitted to the vehicle's wheels. If the vehicle is equipped with a tyre repair kit, the tester will typically check that the kit is present and appears to be in a serviceable condition. They are not expected to test the efficacy of the sealant or compressor. The main concern remains the condition of the tyres currently fitted to the vehicle's axles. If a tyre has a puncture and the repair kit has been used, the vehicle might still pass the MOT if the repair itself is considered temporary and safe for continued use for a limited period, or if the tyre is replaced with a roadworthy one. However, permanent repairs to a tyre's sidewall or a repair in the wrong area of the tread can lead to an MOT failure.
For instance, if a tyre has a simple puncture in the tread area and has been repaired using a plug or patch from a kit, and the repair is sound, the tyre may be acceptable. But if the repair is poorly executed, or if the damage is more significant (e.g., a sidewall gash), the tyre would fail. The MOT tester's role is to assess the safety of the vehicle on the road. A properly applied temporary repair might be deemed safe enough for the vehicle to pass, whereas a poorly done or inappropriate repair would not. It's always best to have any tyre damage professionally assessed and repaired or replaced after using a repair kit.
Tyre repair kits are generally accepted as a valid alternative to a spare tyre for MOT purposes.
Understanding MOT Tyre Rules: Beyond the Spare
While the spare tyre question is common, the MOT test's scrutiny of tyres extends much further, covering all four wheels fitted to the vehicle. The DVSA has stringent MOT rules regarding tyres to ensure that every vehicle on the road is safe. The focus is always on the condition and suitability of the tyres currently mounted and in use. For example, a cracked windscreen might be a reason for failure, and similarly, tyres with certain types of damage or wear will lead to an MOT fail. A MOT test windscreen chip, if within the driver's direct line of sight and larger than a specific size, can cause a failure, highlighting the importance of visibility and structural integrity for safety systems.
The regulations surrounding tyres are clear: they must be free from any damage likely to cause danger, including cuts, abrasions, or tearing on the sidewalls. Any bulge or blistering on the tyre's surface is also a definite fail. The minimum tread depth of 1.6mm is a strict legal requirement, and testers will use a depth gauge to check this accurately. Tyres that are unevenly worn to the point where the wear indicators are exposed or where the tread is significantly below the legal limit will not pass. The MOT tyre rules also consider the tyre's age; while there isn't a strict age limit for an MOT fail, tyres showing signs of significant degradation due to age, such as hardened rubber or multiple hairline cracks, could be deemed unsafe.
Furthermore, the type and size of tyres fitted must match the manufacturer's specifications for the vehicle. Mixing different types of tyres on the same axle (e.g., a budget tyre on one side and a premium tyre on the other, or even different tread patterns) is not permitted and will result in a fail. This is because it can affect the vehicle's handling and braking, particularly in adverse weather conditions. The DVSA new MOT rules, and indeed the long-standing regulations, aim to ensure uniformity and safety. If you're ever unsure about a specific tyre issue, such as a MOT tyre rules query or the implications of a MOT test windscreen chip, consulting the official DVSA guidelines or a qualified MOT centre is always advisable. Understanding these detailed MOT rules ensures you're not caught out.
Ensuring your vehicle’s primary tyres meet all MOT regulations is paramount for passing the test.
Check your vehicle's handbook for the manufacturer's recommended tyre sizes and pressures, and always ensure your fitted tyres match these specifications.