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Hi guys, apologies if this question has been asked and answered elsewhere but I'm having difficulty in identifying a part on my rear wheel. I'm busy restoring / rebuilding a '79 CB250T and whilst taking the rear sprocket off to clean the wheel and replace the bearings I encountered this mysterious part which does not show up on the parts fische.
It looks like a spacer and is located behind the rear sprocket.
The part is quite severely worn and in fact it is broken so obviously needs to be replaced but I cannot identify it on the parts fische. Here is a detail close-up of the part.
ID of the part is 65 mm.
Any advice?
Paul

The part is quite severely worn and in fact it is broken so obviously needs to be replaced but I cannot identify it on the parts fische. Here is a detail close-up of the part.

ID of the part is 65 mm.
Any advice?
Paul