I installed 275/40 R17 Sumitomo HTR ZIII tyres on the back of my 2001 GS430, they run pretty nice and i believe they don't affect the cars performance in straight line. The tyres I had before where the factory sport package 235/45 R17 tyre, they where dunlope direzza dz101 and it had much worst traction... I want to know if 275/40 tyres affect negatively in some way my car... since 235/45 is the original sport package size... Anyone has had experience in this? I think wider tyres in the back help improve grip in turns but might affect handling a little.. I'm really not sure this is why i open this forum... Any suggestions?
