Just curious if there's anyone who knows if there is any significant grip difference between 265/35/18 tyres and 255/40/17 assuming all else is equal?

 

Grip difference will be minimal. Grip per $$$ will be far inferior with the 265/35-18s.

There are a few good tires that come in 265/40-17. My RX-7 is on 255/40-17 front, 265/40-17 rear Dunlop StarSpecs.

Others: http://www.tirerack.com/tires/TireSe...40&diameter=17

 

I'm running 265/40/17 dunlop star specs and rear feels more stable and Its harder for me to spin those tires than 255

 

thats probably because your effective gear ratio is slightly higher