If it's the KZ650B spoke wheels, they were 1.85x19 front and a 2.15x18 rear. I think the Kz650C with cast wheels used the same size. KZ650SR used the same front, but a 16" rear in 2.5" width far as I know.
321,000 miles on KZ's that I can remember. Not going to see any more.
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