may sound a little odd question but thought i ask anyway, i had goodyear f1 225 40 18 fitted while back, they replaced the conti sport (same size as the goodyear), but i noticed straight away on the goodyear that the PROFILE (40) seems to be less thicker than the conti sport, whay is that?? any ideas, i did compare this morning to my mates r32 who has the same tyre size as mine (his are yokohamas tyres) and his profile (40) seems much thicker than the goodyear