I have come across a cheap 81 XJ750 I am keen to customise, scrambler or bobber (most likely) is my current idea. I have a couple of front ends, one of which I will swap onto this (03 R6 or 1997 GSXR750) but they are both a tri-spoke alloy wheel. Is there another rear wheel from a later bike I can swap into this that will match (or at leats be close). I'm thinking a later XJ or FJ?? I understand that clearance will be an issue as there is little clearance on the standard tyre, so probably a 3.5 inch rim is going to be the limit! Any assistance appreciated.