MOT Tyre Requirements in Scotland: What Will Fail Your MOT

# MOT Tyre Requirements in Scotland: What Will Fail Your MOT

Your MOT test includes a comprehensive tyre inspection. Tyre-related failures are among the most common reasons for MOT failures in Scotland — and most of them are easily avoidable with a pre-MOT check. Here is exactly what inspectors look for.

What MOT Inspectors Check on Tyres

MOT testers check each tyre against the standards set in the DVSA (Driver and Vehicle Standards Agency) MOT inspection manual. The main checks are:

1. Tread Depth

The legal minimum is 1.6mm across the central three-quarters of the tyre, around the full circumference. Inspectors measure tread depth using calibrated gauges, typically at multiple points. Even one measurement below 1.6mm in the checked area results in an immediate fail.

2. Tread Pattern

The tread must be clearly visible and not excessively or unevenly worn. A tyre with tread worn smooth in places — even if the depth at other points exceeds 1.6mm — can fail.

3. Sidewall Condition

Inspectors check for:

• Cuts or gashes: Any cut exposing the ply or cord beneath the rubber is an automatic fail
• Bulges or lumps: Indicate internal structural failure — automatic fail
• Cracks: Deep cracking or crazing in the sidewall, particularly if cords are visible
• Deformation: Any area of the sidewall that appears misshapen under load

4. Mixing Tyres

Mixing radial and cross-ply tyres on the same axle is an automatic fail. On vehicles with more than two wheels on an axle, all tyres on that axle must be the same type.

5. Type Suitability

The tyre must be appropriate for the vehicle — correct size, sufficient load index and speed rating for the vehicle specification. Non-standard or incorrectly sized tyres can result in a fail.

6. Condition of Bead Area

The bead (where the tyre seats on the rim) is inspected for damage or separation. A damaged bead cannot form an airtight seal.

7. Tyre Security

Tyres must be properly seated on the rim with no signs of slippage or separation.

What Causes an Automatic MOT Tyre Fail?

The following result in an immediate fail with no advisory — the vehicle cannot legally be driven from the test centre on that tyre:

• Tread depth below 1.6mm at any measured point in the checked zone
• Bulge, lump, or deformation in the tyre
• Cut exposing plies or cords
• Tyre that is clearly not in contact with the road (separated bead)
• Mixing radial and cross-ply tyres on the same axle

What Gets an Advisory Note?

Advisory notes do not cause a fail but indicate that attention will be needed before the next MOT:

• Tread depth between 1.6mm and approximately 2–3mm (not an automatic fail, but inspector will note it)
• Minor surface cracking in the sidewall without cord exposure
• Slight but not severe uneven wear

How to Check Your Tyres Before MOT

1. Tread depth: Use a gauge or the 20p coin test. Check across the full tread width and around the circumference. Replace anything approaching 2mm or below.
2. Visual inspection: Walk around the car and inspect each tyre for bulges, cuts, or obvious cracks. Check both the outer and inner sidewalls if you can see them.
3. Age: Tyres over 10 years old can fail — check the DOT date code on the sidewall (last four digits: week and year of manufacture). A tyre marked 3218 was made in week 32 of 2018.
4. Inflation: Properly inflated tyres are less likely to show deformation and show wear patterns more clearly. Check pressures against the vehicle placard.

Getting Tyres Fitted Before Your MOT in Scotland

If your tyres are borderline or failing, the most cost-effective approach is to get them replaced before you attend the MOT — a tyre fail means you will pay for the test again plus the tyre fitting.

Tyre Rescue can fit new tyres at your home, workplace, or even at the MOT centre before your appointment:

• Call 0141 266 0690 with your tyre size
• Same-day or emergency fitting available if your MOT is imminent
• Budget options from approximately £55–£70 fitted for common sizes

It is often quicker and cheaper to have tyres fitted at home before the MOT than to deal with a fail and re-test fee (typically £30–£60) plus rushed fitting on the day.

MOT Tyre Checklist

Before presenting your vehicle for MOT, verify:

• [ ] Tread depth above 2mm (ideally 3mm) across all four tyres
• [ ] No visible bulges, cuts, or sidewall damage
• [ ] All four tyres are the same type (all radial, or all cross-ply)
• [ ] Tyre sizes match the vehicle specification
• [ ] No visible tread wear indicators exposed
• [ ] Tyre age under 10 years (check DOT date code)

Call 0141 266 0690 to book pre-MOT tyre fitting anywhere in Scotland. We will bring the right tyres to you and have you ready for your appointment.

[Tyre tread depth guide](/blog/tyre-tread-depth-guide-scotland) | [Signs you need new tyres](/blog/signs-you-need-new-tyres) | [Mobile tyre fitting Scotland](/mobile-tyre-fitting)