Swannie wrote:i might have missed something, but i can't seem to find a 9100 short cage rear derailleur???
There doesn't seem to be any. They have adopted a single "mid cage" option to accommodate all cassettes up to 30T.
Moderator: robbosmans
goodboyr wrote:Looks to me like one is made for internal and one is made for external. Look at these two pictures. The 101 version looks like the old D Fly that was supposed to be attached to the seatstay (of course most of us put it inside the frame anyhow). The 111 is different. It has its connectors in line and is thinner and has no attachement "ears".
http://productinfo.shimano.com/#/spec/2.0/GENERAL%20Di2%20spec/Wireless%20Unit?q=EW-WU101&popup=1&from=ti
http://productinfo.shimano.com/#/spec/2.0/ROAD%20Di2%20spec/Wireless%20Unit?q=EW-WU111&popup=1&from=ti