The hub is a Deore LX (HB-M570) MTB hub. I bought the wheel new about 2 years ago. Its not been serviced, but I haven't noticed any problems until now. I pulled the hub apart tonight and cleaned all the ball bearings, and cleaned all the grease out of the hub and off the cones. I regreased it with marine bearing grease (I have tons of the stuff) like I do all my other hubs (and bottom brackets, and head sets) but the thing is still very gritty. Is the hub trashed? No amount of adjustment will make it smooth. I've rebuilt hubs like this before without problems.