fiddling around with parts.
Got the CB900F swing arm mounted in the CB750F frame. Got to looking at the ol GS1100E , and pulled the rims off it. Right at the moment, The rear is fitted with a 130/90/17 tire, and it fills the new space quite nicely, pretty much the same height as the stock 120/90/18.
I would have to find a 530 rear sprocket for the suzy wheel tho, or a 630 front sprocket for the 74k motor. Havent put the front rim on yet.....still eyeballing the front rotors to caliper clearances. Definitely have to use the rear caliper and arm off the suzy to fit the much larger rear disc. Looks good.......will have to take some pics tonight.