I have been building an extended swingarm for a kz750 That is using 08 r1 wheels and front suspension.
I used 1".065 wall chrome moly tubing.it is 6 inches over stock and uses direct mount air shocks.
custom machine,fab,welding,cylinder boring/sleeving,cylinder head rebuilding,swingarm mods,front end conversions,kz frame brace kits. email me : leonholmes@sbcglobal.net call me:Leon 918-638-1748