Non-US LCs got 5.5, 6, and 6.5" (newer) rims. IIRC, they're all nearly at 0 mm offset (?) and thus sit further inward anyway. The big hullabaloo on 'mud is that the pre-91 cruisers required a maximum of 3.5" backspacing to clear steering components.
The bearings take it on two parts, one is from the offset (91-97 =0mm) and the other is kingpins during turning which you want to have the contact patch in the same location as you bump up in tire size. That angle is roughly in front of and centerto the contact patch. It is very hard to get both of these correct.
It is a matter of aesthetics more than anything at this point. If you want your tire absolutely flush with the side, you may need a ~1" spacer. As for components, the inside tire wall should be the ~ same plane as the 275 tire that came stock. I've run many spacers to correct for the above, but I also prefer greatly the look of an OEM tire where some folks do not.