Because most part-worn tyres on sale fall short of the law, anyone buying one needs to inspect it properly before handing over money. These are the checks that separate a legal, sound tyre from the rest. If a tyre fails any of them, the answer is to walk away.
The buyer's checklist
- The 'PART WORN' stamp: permanent capital letters at least 4mm high, not cut or branded into the rubber. No stamp means an illegal sale, full stop.
- Approval markings: an 'E' mark, plus the correct size, load index and speed rating for the vehicle.
- Tread: at least 2mm across the full width and all the way round, with the original grooves completely visible. Patchy or shallow tread fails.
- Condition: no cuts, lumps, bulges or exposed cord, and no bead damage. Look for rubber dust or creasing on the inner liner, which is a sign the tyre was run flat.
- Repairs: any previous repair must be a proper one done from inside the tyre, not an external plug or sealant. A bad repair is a deal-breaker.
- Inflation and inspection: a legitimate seller inflates and inspects the tyre, inside and out, in front of the buyer.
It is also worth checking the age: the date code on the sidewall shows when the tyre was made, and old rubber can be perished even with tread left.
The red flags
Some signs should end the conversation on their own:
- A rack of tyres with no "PART WORN" markings
- A seller who won't inflate or inspect the tyre, or won't let the markings and tread be seen clearly
- Visible damage of any kind, or evidence of a previous bad repair
- A vague "it's fine" in place of an actual inspection
When the checks pass, and when they don't
A part-worn that passes every check can be legal and serviceable. But the bar is high, the market record is poor, and the unknown history remains even on a compliant tyre. For drivers who would rather not run the gauntlet, a new tyre, the kind ordered online from Tyres.co.uk, removes the guesswork, with full tread, correct markings and a clean history as standard.
From the workshop: the give-away is whether they will pump it up and show you inside. The honest sellers do it without being asked. If someone is reluctant to inflate a tyre and let you look, there is usually a reason, and it is not in your favour.
Sources and accuracy. The checklist and warning signs here reflect TyreSafe guidance and UK regulations at the time of writing, which can change. Anything safety-critical should be confirmed against current official guidance. If anything here looks wrong, get in touch and we will check it and put it right.
Common questions
How can I tell if a part-worn tyre is illegal?+
Check six things: a permanent 'PART WORN' stamp in 4mm capitals, an 'E' approval mark and correct size and ratings, at least 2mm of tread across the full width with the grooves fully visible, no cuts, bulges or exposed cord, only proper repairs, and an inflation and inspection done in front of you. If any is missing, walk away.
What does a legal part-worn tyre have to be marked with?+
The words 'PART WORN' in permanent capital letters at least 4mm high, not cut or branded in, alongside the 'E' approval mark and the size, load index and speed rating. A tyre with no 'PART WORN' mark is being sold illegally.
What are the warning signs of a bad part-worn tyre?+
A rack of unmarked tyres, no offer to inflate and inspect the tyre, visible cuts, bulges or exposed cord, an external plug or sealant residue inside, rubber dust or creasing on the inner liner from running flat, and an old date code. Any of these is a reason not to buy.
Should a part-worn tyre be inspected before I buy it?+
Yes. A legitimate seller inflates the tyre and inspects it inside and out before sale, and will show you the condition. If a seller won't do this or won't let you see the markings and tread clearly, treat that as a red flag.