I am looking for a knowledgable Shimano Nexus mechanic in the Denver area. Any ideas? My 8 speed Nexus has started skipping/slipping in fourth gear. It sounds and feels a bit like the chain skipping a cog but it is in the hub.
Alas, finding a competent and experienced mechanic is the bane of IG hub users. A few months ago I was considering sending my hub to Harris for an overhaul, but shipping+labor was going to cost as much as a new hub, so in the end I decided to overhaul the hub myself. It was a success, mostly.
A few thoughts:
--Are you quite sure the cable isn't out of adjustment, even a tiny bit?
--I don't know if this applies to the Nexus, but with the Sturmey Archer 8-sp hub, cone adjustment is just as important as cable adjustment. If the cones have loosened a tiny bit, some gears will not register properly.
--The problem could be in the shifter, in which case the solution is a new shifter. I have heard the Nexus-8 twist shifters wear out pretty quick.