265 35 18 would work with c55 stock 18 inch rear wheels??

also!

245 40 18 would work with c55 stock 18 inch front wheels?

 

Depends on the brand of tire but yes, generally speaking, that should work. I had that exact set up with my winter tires (Dunlop SP Wintersport), which I would consider to run large or "fat" due to the large rubber blocks surrounding the lip of the tire, and I did not have any rubbing issues. You will have a little bit of a "ballooned" look, where the lip of the tire will hang out over the rim. 255 is best for the rear in terms of looks IMO.

 

Yes they will fit, mustang guys put oversize tires on all the time. Like 275 285 on a 8.5 rear.

 

Ok Thanks..^^