Anybody know what wheel this is?

1979 KZ650B3 = drum brake

www.kawasaki.com/Parts/PartsDiagram/144021/1979/KZ650-B3

Jackson wrote: heres the calliper..

that is definitely a cast iron rotor and a what looks to be a Brembo P108 caliper. IIRC they have dual 41 mm pistons and like a 15mm MC, All of that combined with the magnesium wheel makes me think this was a race bike at some point as those are rare and expensive parts. anymore pics of the bike?

EPM (sold through Magni) had both aluminum and magnesium rims similar to the wheel in question. You could probably tell which it is by the weight.

This could some interesting facts to your wheel and rear disk brake.

You guys are legends!

Looks like you could be right. Since the bikes a American import... could be someone at some point fitted the wheels and brakes?
Couldn’t find any recent links to r b racing? Would really need to get hold of that rear mastercylinder.

As you can see, the bikes a bit of a mash up...

www.rbracing-rsr.com/monoshock_catalog.html

Michael

Man that bike is cool though if a bit mismatched. If that is rear caliper indeed a p108 which I'm 99% sure it is, any 15mm master cylinder should work, do you have a brembo MC on it now?