This is from the Phattire site http://www.phattire.com/phattire1/srx9espremob.html:pipspeak said:Hi all... I'm in th market for a new rear derailleur (SRAM X.9) but do I need the medium or long cage? (whatever happened to short?). Cassette is 32-11 and front rings are 44-22. Any advice aprpeciated.
The numbers Wombat are technically correct and often used to demonstrate chain capacity as it relates to derailleurs and cage length, but the forumla is simple and assumes you'll be using a small/small cross-chain combo with some regularity.pipspeak said:thanks... sounds like I need a long cage. I noted that the chainwrap spec for the med-cage X9 is 38, which implies it's designed for 8-speed drivetrains (or small chainwheels).