If you want/need a 3 speed hub with auto shifting Shimano makes such a system. I believe though that it also requires their special generator front hub for the system to provide power to the control electronics which are in a third module which mounts to the seat tube. It also has a control module for handlebar mounting. A lot of wire to be run between the various components.
This makes conversion of an older bike more expensive by far than just installing a manually shifted 3 speed hub from Sturmey Archer, SRAM or Shimano.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/
Last edited by tatfiend; 01-21-10 at 11:57 PM.
Reason: typo