Braking force coefficients obtained with a sample of currently available radial ply and crossed ply car tyres.

This note gives the braking force coefficients of 5 radial ply and 5 crossed ply tyres on 4 wet road surfaces at speeds of between 30 mile/h and 130 mile/h. The coefficients were evaluated by braking the front wheels of a car until these locked and measuring the resulting deceleration. Both "peak" and "locked wheel" braking force coefficients could be determined from the records.