It's time to replace my Conti's. I reckon there's probably another 3000-4000 miles in them (they're at 12000 just now) but the stability has become a total joke. It's darting around all over the place at the slightest wee mark on the road.In fact,I have to slow down over the back road I take to work,it's such a struggle to hold it in line. I'm sure new tyres will cure it though,as there are no peculiar wear patterns to suggest any mis-alignment. I fancy the F1's,but can anyone tell me the full spec I need ? I remember all sorts of codes like 'GSD3' or something ? It's the S-line 18 inchers,by the way. Ta.