In the UK the minimum legal tread depth is 1.6 mm, however it is recommended to have them changed when they reach 2 mm, but the manufacturers recommend 3 mm.
If the tread depth reduces below the recommended changing time the tyres efficiency of moving water from the road surface reduces and the increased risk of aquaplaning increases. This causes reduced traction between the road and the tyre and braking becomes less responsive increasing the stopping distance.
Research conducted by MIRA shows that having 3 mm tread improves performance over those with 1.6 mm tread which translates to an improved braking distance of up to 8 m in wet conditions.
These indicators can be found at points in the tread around the tyre surface. You will see occasion raised areas in the tread grooves. When the tyre surface is level with these raised areas you are approaching 1.6 mm and you should contact us to change your tyres.