Mine are going too.. less than a year. 8000 miles, Bridgestone S02 N3 (one track day on the hottest day of the year didnt help) I get one set of fronts to two sets of rears. the N rated S02 tyres are impossible to get now so I really dont know whether to change.... Plus I have 2 new Bridgestone front 225 16in wheels in the garage... Angus