Pedaling force tightens the lock sprocket, freewheel prevents it untighteningThanks. It looks like there should be a lock nut on the exposed bit of thread is that how they always look?
No, UG is six speed. You can fit an 7 speed HG cassette on some UG hubs. The wheel will need redishing and respacing.I must have had the cassette off more than a hundred bikes but I have never seen one of these before.
One more question can I get a 7 speed version?