Tread Depth

TREAD DEPTH

Wear indicator bars, which are raised areas at the base of the tread, serve as a visual warning that the tyre is near to or at the minimum legal tread depth of 1.6mm.
It is recommended that tyres are replaced when 3mm of tread remains. The less tread there is, the greater the stopping distance in the wet, and the greater the risk of skidding.

Also, worn tyres will aquaplane more easily, the limited tread depth being unable to disperse sufficient water to maintain contact with the road surface.