Rear tyre width on a '78 CB550

I've got 17" wheels from an Aprilia RS 125 R modded to fit my CB and I've been looking through tyre options. I'm really liking the look of Dunlop Mutants but not sure what width tyre the rear will take? I'm not looking to put anything stupidly wide, just like to know what width not to exceed.

Cheers I advance, Crispy

Pretty sure it runs a 150/60 so you could go to a 160 (and probably get a better tyre selection).

All the tyre manufacturers have great online specs that tell you recommended wheel widths for each tyre, as well as acceptable min. /max widths.

I spoke to the Dunlop rep at the MotoGP today and he says the Dunlop Mutant will fit in the 150 width. Winner, winner, chicken dinner!