Originally Posted by
Shahmatt
I notice that my second-hand Nexus 7 hub - model SG-7R50 (printed on the hub) does not freewheel much at all.
Furthermore if I pedal backwards the wheel starts turning backwards as well - I don't believe that this is a coaster brake model.
Would this be a symptom of a faulty hub? Would an oil replacement fix the problem?
The problem may be internal, but it could also be gunk rust or build up between the cog and the dust cover.Start by taking off the cassette joint and cog and rule out the simple stuff first. If that's all clean and obstruction free, then it might be time to start looking internally.