What Does 'Tyre Worn Advisory' Mean on an MOT? Serious or Not?

Tyre Worn on Your MOT -- What Is the Tester Telling You?

Of all the advisories you can pick up on an MOT, a tyre worn advisory is probably the one most people shrug off. After all, tyres wear out -- everyone knows that. But there is a difference between knowing your tyres will eventually need replacing and being told by an MOT tester that they are getting close to the limit right now.

So let me explain exactly what this advisory means, why you should take it seriously, and what it is going to cost you to put right.

The Legal Limit -- Where Do Your Tyres Stand?

In the UK, the legal minimum tread depth for car tyres is 1.6mm across the central three-quarters of the tread width, around the entire circumference. New tyres typically start with 7mm to 8mm of tread. So by the time you reach 1.6mm, most of the usable rubber is gone.

When an MOT tester records a tyre worn advisory, they are telling you that one or more of your tyres has tread depth that is approaching 1.6mm but has not yet reached it. Most testers will flag a tyre once it drops below about 2mm to 3mm. Some flag it at 2mm, some at 3mm -- there is no hard rule for when an advisory is raised, only for when it becomes a fail.

The critical thing to understand is this: at 1.6mm, your tyre is legal but its wet weather performance has already dropped dramatically. Tests by major tyre manufacturers show that stopping distances in the wet increase by up to 50% when tread drops from 3mm to 1.6mm. Below 3mm, your tyre is doing a significantly worse job of clearing water from the road surface, which is why many safety organisations recommend replacing at 3mm rather than waiting for 1.6mm. You can read more about this in the Tyre Worn Close to Legal Limit MOT Advisory — When to Replace.

If you are weighing up alternatives, our guide to Engine Management Light On MOT Advisory covers similar ground from a different angle.

How Serious Is a Tyre Worn Advisory?

I rate this advisory as high importance. Not because a tyre is going to blow out tomorrow (worn tyres rarely fail catastrophically unless they are damaged), but because tyres are the single most important safety component on your car.

Think about it. Tyres are the only part of your car that touches the road. Everything else -- brakes, steering, suspension, ABS, traction control -- all of it relies on those four palm-sized contact patches between rubber and tarmac. If the tyre cannot grip, nothing else matters.

A worn tyre advisory tells you that your safety margin is shrinking. In the dry, you might not notice much difference. But in the wet, on a cold morning, or when you need to make an emergency stop, worn tyres will let you down. And by 'let you down,' I mean they might not stop you in time.

Severity rating: high. This is one advisory I tell people to act on promptly.

What Will Replacement Cost?

Tyre prices vary enormously depending on the size, brand, and where you buy them. Here is a realistic breakdown:

For more on this topic, take a look at our Coolant Leak Visible MOT Advisory guide.

Budget Tyres

These are the cheapest option and come from lesser-known manufacturers. They pass all legal safety standards but tend to offer shorter tread life, longer stopping distances, and more road noise.

• Small car (175/65 R14, 185/60 R15): £35 to £55 per tyre fitted
• Medium car (205/55 R16, 225/45 R17): £45 to £70 per tyre fitted
• Large car / SUV (235/55 R18, 255/50 R19): £65 to £110 per tyre fitted

Mid-Range Tyres

The sweet spot for most people. Brands like Firestone, Hankook, Kumho, Nexen, and Toyo. Good performance, decent tread life, reasonable price.

• Small car: £50 to £75 per tyre fitted
• Medium car: £65 to £100 per tyre fitted
• Large car / SUV: £90 to £150 per tyre fitted

Premium Tyres

Michelin, Continental, Pirelli, Bridgestone, Goodyear. Better grip, longer life, lower noise, shorter stopping distances. They cost more but often work out cheaper per mile due to longer tread life.

• Small car: £70 to £110 per tyre fitted
• Medium car: £90 to £140 per tyre fitted
• Large car / SUV: £120 to £220+ per tyre fitted

Run-Flat Tyres

If your car came with run-flat tyres, expect to pay a premium. Run-flats typically cost 20% to 40% more than their standard equivalents.

You might also find our Dual Mass Flywheel Noise MOT Advisory guide useful alongside this one.

The Total Bill

If all four tyres need replacing (which is common if the advisory appears because the car has been running on the same set for a while), you are looking at:

• Budget set of four: £140 to £440
• Mid-range set of four: £200 to £600
• Premium set of four: £280 to £880+

Most people will pay somewhere in the £250 to £500 range for a full set on a typical family car.

How Urgent Is This? Can You Wait?

This depends on how much tread you have left and the time of year.

Above 2mm but below 3mm: You have a few weeks. Get tyres ordered and booked in. Avoid unnecessary trips in heavy rain in the meantime.

At or just above 1.6mm: Replace them this week. You are right on the edge of legality, and a few thousand miles could push you over. Driving on tyres below 1.6mm carries a fine of up to £2,500 per tyre and three penalty points per tyre. Four illegal tyres could mean a £10,000 fine and 12 points -- an instant ban.

Uneven wear (one edge worn more than the other): This needs prompt attention because the thinnest part of the tyre could be below 1.6mm even if the rest looks fine. Plus, uneven wear indicates an alignment or suspension issue that needs investigating. You can learn more about this in the Repeated Rear Suspension Bush Worn Advisory — Should You Walk Away?.

Seasonal consideration: if you are heading into autumn or winter when roads are regularly wet, sort your tyres before the weather turns. Worn tyres and wet roads are a genuinely dangerous combination.

Uneven Tyre Wear -- The Hidden Story

Sometimes the advisory is not just about age and mileage. Uneven wear patterns can reveal underlying problems:

• Worn on both edges: Underinflation. The tyre has been running soft, causing the edges to carry more load.
• Worn in the centre: Overinflation. Too much pressure pushes the centre of the tread out.
• Worn on one edge only: Alignment issue. The wheel is pointing slightly sideways, scrubbing the tyre.
• Cupping or scalloping (patchy wear): Worn shock absorbers or suspension bushes causing the tyre to bounce rather than roll smoothly.

If you replace the tyres without fixing the underlying cause, the new ones will wear out just as quickly. Always ask the fitter to check the wear pattern and advise on alignment or suspension checks. You can find more about this in the Brake Pad Wear Indicator MOT Advisory — When to Replace.

We have covered related ground in our Front Fog Light Not Working MOT Advisory guide, which is worth reading if this subject interests you.

How Tyre Advisories Affect Car Value

If you are buying a used car and the MOT shows a tyre advisory, it is a small but useful bargaining tool:

• One tyre flagged: Deduct £50 to £120 depending on size
• Multiple tyres flagged: Deduct £150 to £400
• Tyres plus alignment issue: Deduct £200 to £500

Sellers often dismiss tyre advisories as trivial, but they represent a real, immediate expense. Stand your ground.

If you are selling, fitting new tyres before listing is one of the best value-for-money improvements you can make. Fresh rubber gives a great first impression on a test drive and removes a negotiating lever for the buyer.

Repeated Tyre Advisories Across Multiple MOTs

If the same car keeps getting tyre advisories year after year, it usually means one of two things:

1. The owner replaces tyres with the cheapest possible options that wear out within 12 months. This is false economy and tells you something about their attitude to spending on the car.
2. There is an ongoing alignment or suspension issue causing premature tyre wear. This is the more concerning scenario because it means fixing the tyres alone will not solve the problem.

You can check the exact safety score for any model on the Euro NCAP website.

Either way, budget for new tyres plus a full four-wheel alignment and potentially some suspension work. You can check the vehicle's history through the GOV.UK DVLA check.

Dave's Parting Advice

Tyres are the one thing between you and the road. A worn tyre advisory is your car's way of saying the safety margin is running out. Do not treat it as a minor inconvenience -- treat it as a prompt to act.

Replace worn tyres with at least mid-range quality, check the alignment, and inspect for underlying issues if the wear is uneven. It is one of the simplest and most impactful safety improvements you can make.

If you are checking out a used car, my vehicle check tool will pull up the full MOT history including tyre advisories. It takes seconds, costs a fraction of a single tyre, and gives you the ammunition to negotiate a fair price. Use it.