Tyres are one of the most common reasons cars fail the NCT. A five-minute check before your test can save a retest.
Short answer: To pass the NCT, each tyre needs at least 1.6mm of tread across the central three quarters around the whole tyre, no cuts, bulges or exposed cord, the correct size and load/speed rating, matching tyre types on each axle and a valve in good condition. Tyres over six years old get an advisory, not a fail.
The NCT tyre checklist
- Tread depth: at least 1.6mm across the central three quarters, all the way round.
- Damage: no cuts, bulges, perished rubber or exposed cord.
- Matching: no mixed tyre types on the same axle, for example summer and winter.
- Size and rating: correct size, load and speed rating for the car.
- Valves: in good condition.
- Spare: where fitted, it must meet the same standard.
Source: odo.ie tyre price guide (April 2026). Read more in legal tyre tread depth in Ireland.
How to check tread at home
Use a tread depth gauge, or look for the small tread wear bars in the grooves. If the tread is level with the bars, the tyre is at or near the limit.
Failed on tyres?
We fit new or part-worn tyres at your home or work before your retest, and make sure both tyres on the axle match. Call 085 196 9572.