Looking to see what tire sizes you guys with FIAs and 15" wheels have used. I've always run 235/60/15 on front and 255/60/15 in back, but I'm looking to replace them with Avons and they don't offer those exact sizes.

I either need to be safe and go smaller (225 front and 245 rear), or step up (245 front, 275 rear), but don't want any clearance issues or fender rub under hard cornering.

Any of you FIA guys run 245s on the front or 275s in rear?

Thanks!