Drivers often imagine issues with their engine, suspension, or even headlights when it comes to an MOT failure. But many MOT failures come down to simple tyre issues.

Everything from tyre tread depth, pressure, and visible damage can result in an MOT fault. If it’s over the line, it becomes a failure point. A quick pre-MOT tyre check (often free) can prevent failure, save money, and avoid a re-test. The last thing you want is an MOT tyre failure costing you hundreds of pounds extra.

Why Tyres Are a Major MOT Failure Point

Tyres aren’t an afterthought. They’re the only part of your car that touches the road, and so, the one most susceptible to damage and wear. Tyres must adhere to strict legal standards for tread, condition, and size.

Most failures relate to:

• Tread below 1.6mm
• Cuts, bulges, or exposed cords
• Incorrect tyre size/type
• Unsafe repairs

Most of these are simple fixes with a tyre replacement. It might feel harsh to fail your vehicle for its tyres. But poor-quality tyres directly affect braking distance and safety.

Check Your Tread Depth Early

The UK legal minimum tread depth is 1.6 mm across the central ¾ of the tyre. MOT testers fail tyres under this immediately.

But this is only the minimum. We recommend replacing tyres at 3 mm due to safety issues. Wet or icy weather can increase the risk of your car sliding under this limit.

You can test your tyre tread depth yourself. Take a 20p coin and place it in the tread. If the outer rim is fully covered, the tread depth is at least adequate.

It’s not just tread depth, though. Uneven wear can also cause a failure if it indicates an underlying problem.

Look for Visible Damage

How do you perform a tyre damage check? Inspect your tyres for:

• Cuts
• Bulges
• Cracks
• Exposed cords
• Embedded objects

Any damage to the tyre’s sidewall cannot be repaired and is an instant failure. Even small cracks show the rubber is ageing and may not pass. That’s why it’s so important to stay on top of tyre maintenance and care.

Check Tyre Pressure and Size

Tyre pressure isn’t an automatic failure. But incorrect tyre pressure can cause numerous problems. Underinflated tyres affect braking and stability, altering tyre wear. Always follow the correct PSI listed on the door frame or handbook.

The only exception to tyre pressure is a tyre pressure monitoring system (TPMS). A working TPMS is required as part of the MOT for cars first used on or after January 2015.

Tyres should be the same size and type across each axle for an MOT pass. Mismatched tyres, e.g., different speed ratings or construction tyres, can cause a failure. It can also cause long-term problems for your vehicle.

Pre-MOT Tyre Checks Save Money

A failed MOT often means unexpected repair costs, a re-test fee, and the hassle of rearranging your plans. A quick pre-MOT check helps you spot tyre issues early, giving you time to shop around for replacements instead of paying last-minute prices.

Many garages offer free tyre safety checks, which take only a few minutes but can save you stress, time, and money on the day of your MOT.

Not sure if your tyres will make it through the MOT? Visit for a quick inspection and avoid an unnecessary fail.