I posted this in mechanics thread as well, but it is a s/s question. I have a cog threaded on an old hyperglide cassette, and tonight I noticed a bad grinding noise, could feel it as well, coming from the cassette. Checked all the usual suspects, cones, bearings, etc, and still a nasty noise. Constant as well, but worse when I coast and loader at a certian point in the wheels rotation. Any ideas on what to look for, or could it be that the internal part of the hub that makes up the 'freewheel' is gone? Don't know anything about the inner workings of the cassette. I've had the wheel for 4 years and bought it used so I don't know how old it is, or how well it maintained before I had it. I only started to use it alot 8 weeks ago. Any ideas/suggestions are welcome. I don't really want to switch to the axiom hub yet, it's too loud.