Senior Member
Join Date: Feb 2006
Location: Sin City, Nevada
Posts: 2,886
Bikes: Catrike 700, Greenspeed GTO trike, , Linear LWB recumbent, Haluzak Horizon SWB recumbent, Balance 450 MTB, Cannondale SM800 Beast of the East
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The question is about switching the rear derailleur. No mention of changing the FD. In this case the only two factors I can see make a difference is the distance the RD will move from right to left and the span of gearing it was designed for. When I changed the RD on my Catrike 700 from SRAM to Shimano there was only one RD recommended by Sheldon Brown that would move across the 10 speed cassette and 11/36 gear range for the cassette. It was a good suggestion as it worked just fine. Also needed to change the bar end shifter though.