Nittos tend to run small.. Sport Cup 2's are pretty normal when compared to others. Yes, Toyo R888's run larger.. I have 315 R888 on a 11 inch rim and it will have no problem fitting a 11.5" rim.
You should be fine with the 325 Cup 2's on a 11" rim (although 11.5" is the ideal width for 325's).. Just move the harness or get a 5mm spacer. ZL1 addons makes them.
R888 315.. They are 12.5" wide mounted.
