MOT Failures: Common Tyre Issues

Why Your Motorbike Tyres Might Be Failing the MOT

The MOT test is a crucial annual check to ensure your motorbike is roadworthy and safe. While many components are scrutinised, tyres often play a significant role in whether your bike passes or fails. Understanding the common tyre-related reasons for MOT failures can save you time, money, and the frustration of a failed test. This article will delve into the specifics of what examiners look for regarding your motorbike's tyres and provide actionable advice on how to ensure they meet the required standards.

Key Areas of Tyre Inspection During an MOT

During an MOT inspection, a vehicle examiner will meticulously check your tyres for several critical factors. These are not arbitrary checks; they are all directly related to the safety and performance of your motorbike. Failing to address any of these can lead to an MOT failure.

1. Tread Depth: The Minimum Requirement

This is perhaps the most common reason for tyre-related MOT failures. The legal minimum tread depth for motorcycle tyres in the UK is 1mm across 75% of the tyre's width. However, it's crucial to remember that 1mm is the absolute bare minimum for passing the test. For optimal grip and safety, especially in wet conditions, it's highly recommended to replace tyres well before they reach this limit. Examiners will check the tread depth across the main contact area of the tyre. Worn patches or uneven wear can also be an issue, even if the minimum depth is met elsewhere.

What to look for:

• Wear indicators: Most tyres have small raised bars within the main tread grooves. When the tread wears down to the level of these indicators, it's time for new tyres.
• Depth gauge: A simple tyre tread depth gauge is an inexpensive tool that can help you regularly check your own tyres.
• Visual inspection: Look for obvious signs of excessive wear, especially on the edges or centre of the tyre.

2. Damage and Cuts: More Than Just a Scratch

Any damage to the tyre that could compromise its structural integrity will result in an MOT failure. This includes:

• Cuts: Cuts that are deep enough to expose the canvas or cord beneath the rubber are a definite fail. Even shallower cuts can be problematic if they are extensive or in a critical area.
• Lacerations: Similar to cuts, significant tears in the tyre wall or tread are unacceptable.
• Bulges or Perishing: The sidewalls of your tyres are just as important as the tread. Any signs of bulging, blistering, or cracking (perishing) indicate that the rubber has degraded and the tyre is unsafe. This often happens if a bike has been left standing for a long time or exposed to harsh weather conditions.
• Rebuilt or Remoulded Tyres: These are not permitted for use on motorbikes and will fail the MOT.

3. Incorrect Tyre Type or Size

Your motorbike is designed to work with specific tyre sizes and types. Using incorrect tyres can affect handling, stability, and braking performance. The MOT test will check if the tyres fitted match the specifications recommended by the manufacturer, which are usually found in your bike's manual or sometimes on a sticker on the frame.

• Size Mismatch: Both front and rear tyres must be the correct size as specified by the manufacturer.
• Tyre Construction: For modern motorbikes, radial-ply tyres are standard. Using cross-ply tyres where radials are specified, or vice versa, can be a failure point.
• Speed and Load Ratings: Tyres must have appropriate speed and load ratings for your motorbike. While examiners might not always check the exact ratings unless there's an obvious mismatch, using significantly under-rated tyres is dangerous and could be flagged.

4. Foreign Objects Embedded in the Tyre

If a nail, screw, or any other sharp object is embedded in the tyre tread and cannot be safely repaired (i.e., it's too close to the sidewall or too large), it will lead to an MOT failure. While a puncture repair might be possible in some cases, the repair itself must be carried out to a recognised standard.

5. Uneven Wear

Even if your tread depth is above the minimum legal limit, significant uneven wear across the tyre’s surface can cause an MOT failure. This can be caused by:

• Incorrect tyre pressures: Over or under-inflated tyres wear unevenly.
• Wheel misalignment: If your wheels are not aligned correctly, it can cause rapid and uneven tyre wear.
• Suspension issues: Problems with your motorbike's suspension can also contribute to uneven tyre wear.

An examiner will look for 'flats' caused by excessive braking or cupping/scalloping patterns that indicate suspension or balancing issues.

What to Do If Your Tyres Fail the MOT

If your motorbike fails its MOT due to tyre issues, don't panic. You have a few options:

1. Get them replaced: The most straightforward solution is to replace the offending tyres with new ones that meet the correct specifications. Consider reputable brands like Bridgestone or other quality manufacturers known for their performance and durability.
2. Repair if possible: If the damage is minor and repairable (e.g., a small puncture in the tread area), a professional repair might be sufficient. However, ensure the repair is carried out to industry standards.
3. Seek professional advice: Companies like Mobile Brakes & Tyres Limited, with over 10 years of experience, can help. They offer MOTs, tyre replacements, and servicing. They can assess your motorbike, carry out necessary repairs or replacements, and re-test it to ensure it passes.

Choosing the Right Tyres for Your Motorbike

Selecting the correct tyres is vital not just for passing the MOT but for your safety and riding experience. When choosing new tyres, consider:

• Manufacturer Recommendations: Always refer to your motorbike's manual for the recommended tyre sizes, speed ratings, and load capacities.
• Riding Style and Conditions: Think about the type of riding you do. Are you commuting, touring, or engaging in spirited riding? Different tyres offer different characteristics in terms of grip, longevity, and performance in various weather conditions.
• Quality Brands: Investing in quality tyres from reputable brands ensures better performance, durability, and safety. Brands like Bridgestone, Michelin, Pirelli, and Dunlop are well-regarded in the motorcycle community.

Proactive Tyre Maintenance: Your Best Defence

The best way to avoid MOT failures and ensure your safety is through regular and proactive tyre maintenance. This includes:

• Regular Pressure Checks: Check your tyre pressures at least once a month, and before long journeys. Incorrect pressures are a leading cause of uneven wear and can affect handling.
• Visual Inspections: Make it a habit to visually inspect your tyres for any signs of damage, embedded objects, or excessive wear every time you use your bike.
• Balancing and Alignment: Ensure your wheels are properly balanced and aligned, especially after tyre changes or if you notice any unusual handling characteristics.

Customer Testimonials: The Importance of Good Tyres and Service

Many riders have experienced the benefits of having quality tyres fitted and receiving excellent service. For instance, comments about 'Two Tyres' often highlight:

• Good prices and quick delivery: Stuart Mitchell's feedback on Bridgestones mentions a good price and next-day delivery.
• Expert advice: Craig Norman found the advice and recommendations from Chris at Two Tyres to be helpful in choosing the right tyres for his bike.
• First-class service: James Ogston praised the quality product, sensible price, and quick delivery.
• Personal touch: Colin Newton appreciates speaking to knowledgeable individuals like Chris, who provides advice and discounts, especially for riders with multiple bikes like the ZZR 1400.

These testimonials underscore the value of not only having good tyres but also receiving knowledgeable support when making choices. Companies like Mobile Brakes & Tyres Limited aim to provide this level of service, ensuring your bike is not only safe but also performs optimally.

Frequently Asked Questions (FAQs)

Q1: What is the legal minimum tread depth for motorcycle tyres in the UK?
The legal minimum is 1mm across 75% of the tyre's width.

Q2: Can I use tyres of a different size than recommended by the manufacturer?
No, using tyres of a different size or type (e.g., cross-ply instead of radial) than specified by the manufacturer can lead to an MOT failure and is unsafe.

Q3: What constitutes tyre damage that would cause an MOT failure?
Significant cuts, lacerations, bulges, perishing (cracking or blistering) on the sidewalls or tread, and embedded objects that cannot be safely repaired will cause a failure.

Q4: How often should I check my tyre pressures?
It's recommended to check your tyre pressures at least once a month and before any long journeys.

Q5: Where can I find information about the correct tyres for my motorbike?
Your motorbike's owner's manual or a sticker on the frame usually contains the manufacturer's specifications for tyre size, type, and ratings.

Conclusion

Ensuring your motorbike's tyres are in good condition is paramount for both passing your MOT test and maintaining your safety on the road. By being aware of the common failure points – tread depth, damage, correct specifications, and evenness of wear – you can take proactive steps to maintain your tyres. Regular checks, proper inflation, and choosing quality replacements when needed will not only keep your bike legal and safe but also enhance your overall riding experience. If in doubt, always seek advice from qualified professionals who can help you keep your wheels in peak condition.

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