I have had them on my NB 997.1 235 front , 295 rear, and now on my WB 997.2 235 front 305 rear, its just a matter of playing with the spacers to get the stance correct on the NB I ran with 5mm spacers all round on the WB 5mm front and 15mm rear with Michelin boots. The offsets dont seem to be an issue
What I cant answer is how 255 tyres will look under the arch without spacers but the options are the wheel will happily take a 235, or a 255 with no spacers might work Iby might be able to throw more light on that for you .
I know I had considered 245 front on the 4S until I found to not upset the AWD I would have had to run 325 rears which again with no spacers would probably have worked as I have seen WB cars running 325s
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