Hey,
Got a weird happening that I can't figure out and wondering if anyone has seen it before.
When I remove, clean and re-lube my chain (pc-850) there is always some roughness in the middle gears on the cassette, the others are fine. There are about 2500 miles on the chain and cassette. This goes away after about 50 miles and then everything runs smooth as silk until next re-lube, about 300 miles. I noticed it after I switched from a home brew chain lube to a bike specific lube from Schwinn. The first time I thought I had somehow messed up the derailleur adjustments and spend some time screwing with them but had no success. The last 2 times I just ignored the issue and like I mentioned it cleared itself up. Any ideas?