I know I will have to roll fenders, but what rims width and ET I need? The pirelli full slicks will be used for race track. How much do I need to roll the fenders? Anybody has done it already? photos?

 

what size/offset are your wheels?

most r-compound 265s are actually much wider than regular street tires.

you would get at least 9.5" in width and +30 offset.

 

you will need to roll fenders and run a 34 offset on the back..
this is my setup on CE28n wheels and it clears JUST!!!

 

what about fronts? the rolling fenders is needed on the back only?

 

Fronts you'll have to heat and manipulate the plastic heat shields.

A word of advice... unless you run a 9.5" wide rim you would be better off getting a narrower tire. Running a wide tire on a narrow rim really doesn't put the stick to the ground. You end up adding weight and drag with next to no additional contact patch.