On my Roadster I moved onto Toyo Proxies T1R, they did over 30,000 miles no problem and were only changed as they were 6yrs old. They did 'flat spot' a bit when parked up for a couple of weeks.
Then tried Continental Premium Contact 5, which get good reviews in independent tests, did another 10,000 on those no problem, very little wear evident. The bonus of these is they do a FR version which is a 'rim protect' band which slightly projects from the sidewall to save kerbing your expensive wheels.
Mine was on 16 inch wires, so not all brands may do 15 & 16
