Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,207
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.
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There have been reports on internet of people trying to service bearings on ones that are not supposed to be user serviceable, but instead they broke wire connections by trying to fix something that was not broken.
And there have been reports of people thinking that the bearings were too tight so they tried to loosen them, also broke wiring connections.
A dynohub does not "feel" like a normal hub, you can't turn the axle when you are holding the hub or wheel, so don't assume something is wrong when that happens. The magnets inside prevent it from feeling like a normal hub.
This is not a failure, but an occasional complaint - but some people feel a vibration in their handlebar at slow speeds due to the rotating magnetics and magnetic fields, but has not been an issue for me. I think you are more likely to notice this with a light weight randoneering bike that with a touring bike, I suspect the heavier components and tires dampen any vibration.
Mine has been great, SP PV-8.
They are not sumbersible, so do not ford any deep streams.