Pit Bull Growler XOR BG2.5 on a 550

I am tire shopping was looking at bearclaws , But can get pit bull growlers BG2.5 for anot much more
want to stick with stock rims but wondering if i should stick to stock size or bump up to the 26-9 R12 for front and 26-11 r12 for back. will these have any clearance problems would that be to much tire for the 550 .