245/40 and 275/35 should fit.
Have that set-up with PSS on 8.5 ET38 and 9.5 ET22s.
Especially with the rounded sidewalls on the PSS--less likely to get inner or outer liner rub. Star Specs or a more aggressive footprint and square shouldered tire in 275s is
more of a fitment challenge, in that case 235/265 might be recommended.