Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,211
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Mentioned: 48 Post(s)
Tagged: 0 Thread(s)
Quoted: 3461 Post(s)
I looked at a Shimano exploded diagram, it does look like one side has cup and cone bearings. I also watched a youtube video of someone taking a Shimano apart. Bottom line, I decided that if I tried to do anything on my Shimano dynohub, I would likely regret it. So as long as it keeps working, I am not touching it.
Most of my rear hubs are Shimano steel axle XT or Deore hubs with quarter inch ball bearings. Every few years I put a bit more new grease into the bearings and on one hub had to put a new freehub on it. But since the rear hubs are free of tiny little wires, I have much less fear of working on the rear than on a dynohub.