Rabbidmk1
XS650 Enthusiast
I am in the middle of this same swap and decided that the FZR1000 320mm rotors are the route to go with the stock radial mount tokico calipers. To get the rotors centered we are machining 6x80 bcd spacers that are hub centric to space the 10mm offset rotors out the needed 15mm on each side. We are also machining a 5mm stepped spacer to lift the radial calipers out to the needed clearance for the larger 320mm FZR rotors. All of this is going on a 72 XS, which out of coincidence does not require cutting to fit the GSXR stem. I ran the 48X30X15mm lower bearing with the 48x30x12mm upper bearing and it fits like a dream.
this photo is pre FZR1000 rotor fittment.
this photo is pre FZR1000 rotor fittment.