What Tread depth means for you
Tread is the grooved rubber on a tyre, channelling water away for grip in the wet. The legal minimum is 1.6mm across the central three-quarters of the tyre. Tyres worn close to that limit are among the most common MOT advisories.
Check all four tyres when you view a car, including the inner edges, which often wear unevenly. Uneven wear can point to alignment or suspension faults. Ask the seller to replace any worn tyres or take the cost off the price.