I noticed Michelin has 265 / 325 available in SC2.
They will fit stock wheels fine.
Has any one done this yet ?

 

No one I know of yet. It would give the overall diameters another .5 inch, so there may be rubbing issues at the current ride height. With adjustable coil-overs, it may be possible to play with that vertically, BUT, I remember hearing about how close the front tires are to hitting the wheel liners, and that the caster settings of these cars have a small acceptable range due to front tire clearance issues. If it is possible, I am sure someone will try.

 

And would there be issues with rear wheel steering?

 

What would be the reason(s)/benefits for doing this, going to 265F/325R?

 

Bigger is always better