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Will My Car Pass Its MOT? The Tyre Checks

Tyres are one of the most common reasons a car fails its MOT - and almost all of it is avoidable with a two-minute check. Here's exactly what the tester looks at.

Updated July 20265 min read

The MOT tyre checks

  • Tread at least 1.6mm across the central three-quarters, all the way round
  • No dangerous cuts, lumps, bulges or exposed cords
  • The correct size and type, matched across each axle
  • An illuminated TPMS warning light is an automatic fail

Tread depth

The tester measures tread across the central three-quarters of each tyre and around its circumference. Below the 1.6mm legal minimum anywhere in that band is a fail. The quickest home check is the 20p test.

Condition and damage

Cuts, bulges, lumps or cords showing through will fail the tyre - and they're dangerous. So will a tyre that's been badly repaired or is fouling part of the car.

Correct size and type

Your tyres must be the right size and load/speed rating for the car, and you can't mix radial and cross-ply tyres on the same axle. It's best to match tyres across an axle for even handling (see our UK tyre law guide).

The TPMS rule

Since 2015, if your tyre pressure monitoring system warning light is on at the MOT, it's an automatic fail - so don't ignore that little horseshoe symbol before test day.

What isn't tested

The spare tyre isn't part of the MOT, but it's still worth keeping legal and inflated in case you need it.

“Tyres are one of the most common MOT fails, and nearly all of it is avoidable. Two minutes with a 20p and a look for that dashboard light saves you a re-test - and if you're borderline, we'll come and sort it before test day.”

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Aaron Duncan
Owner, Grangetown Tyres

Frequently asked questions

What tyre faults fail an MOT?

Tread below 1.6mm, dangerous cuts/bulges/exposed cords, the wrong size or type, mismatched tyre types on an axle, and an illuminated TPMS warning light.

What is the MOT tyre tread limit?

1.6mm across the central three-quarters of the tyre, around its entire circumference.

Does the TPMS light fail an MOT?

Yes - since 2015 an illuminated or faulty TPMS is an automatic fail for cars first used from January 2012.

Is the spare tyre checked in the MOT?

No - the spare isn't tested, but it's wise to keep it legal and inflated.

Can you check my tyres before my MOT?

Yes - we'll come to you and sort any borderline tyres before test day, so you avoid a fail and a re-test.

Need tyres sorted? Let's get you moving.

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