For most UK cars and light vans, the legal minimum is 1.6mm across the central three-quarters of the tread and around the entire circumference. Check more than one point because wear can be uneven.
What to check
Measure the main grooves across the inner, centre and outer parts of each tyre.
A tyre can still be unsafe or fail an MOT because of damage even if its tread depth is above the minimum.
Low tread leaves less reserve for water clearance and future wear; do not use the legal minimum as a maintenance target.
Why several measurements matter
A single reading can hide shoulder or inner-edge wear. Measure around the circumference and compare the four corners. If one area is much lower, treat the pattern as evidence to investigate pressure, geometry or suspension before replacing the tyre.
Do not confuse legal with ideal
The legal minimum is the point below which the tyre is unlawful for the relevant vehicle, not a recommendation to run every tyre down to exactly that figure. Condition, weather, damage and expected mileage before the next check still matter.
TyreDeck can help you spot warning signs, but it cannot inspect the tyre internally, measure damage, verify pressure calibration or certify that a tyre is safe to drive on. If you are unsure, avoid unnecessary driving and arrange a competent physical inspection.
What to do next
If replacement is genuinely needed, compare like-for-like tyre specifications and distinguish delivered from fitted prices.
Sources and review
- Jurisdiction
- United Kingdom
- Last verified
- 2026-08-29
- Primary sources
- The Highway Code / GOV.UK
DVSA MOT inspection manual