My friend has a bike fitted with a Nexus 7 on that he commutes on daily and has been in use for a couple of years.
It has started making a noise in the higher gears, most noticeable in 6 and 7 but also present in 5. It is not a clicking freewheel kind of noise, more a squeaking type of noise.
The bike has recently had a new chain and sprocket fitted and the gears adjusted and seems in generally good condition. I am sure the noise is not coming from the saddle or crankset.
Any ideas what might be up and what the fix would be?