Rear wheel size?

[MEHall]

What diameter size should it really be on the CB 650 Z model??
Everywhere on the net it says 17 inch but on my bike it's 18 inch so what is really the correct diameter on the rear wheel??

[cb650]

where are you ay? The 79 USA Z was 17 but the Euro Z was 18. 18 was a silver regular comstar. the 17 was a black revere.

[MEHall]

Well i see, the odd thing though is that all data that i found on the net says 17 inch, even on the model i have that is the 650 Z european model but it IS 18" on mine.
But it seems to be correct that the european 650 Z have the 18 inch rear wheel.