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Medium cage vs. Short cage RD(5 posts)

Medium cage vs. Short cage RDtamjam
Oct 3, 2002 8:51 AM
On the bike I'm building up, I'll be using an 11-28 cassette and 46-34 rings up front, so according to Sheldon Brown's website, I can used either a short cage or medium cage RD and not run into any capacity issues. I am leaning towards a short cage, like an Ultegra or 105, because it would make for a more "compact" drivetrain and have less chain slap. Are there any advantages to running a longer cage that I am missing? (My MTB is singlespeed, so I'm a little rusty when it comes to gears off road).

Thanks.
re: Medium cage vs. Short cage RDatpjunkie
Oct 3, 2002 10:14 AM
if you can get away with short by all means do. It's less to hang up on obstacles as well as less slap
re: Medium cage vs. Short cage RDSteve_O
Oct 3, 2002 12:10 PM
From what I understand...

Short Cage
- Saves weight
- can't go to big cassettes (ie - 11-34T)
- May have some trouble eating up chain slack in a small-small ring combo 9 (but you should be there anyways)

Long Cage
- Heavier
- Handles big gears easier
- More prone to twigs, leaves, and other matter catching it
re: Medium cage vs. Short cage RDOffRoadTourer
Oct 4, 2002 11:20 PM
No road derailler, short or medium, is designed for anything bigger than a 28t rear cog (officially speaking, but I've had success with bigger). The reason Shimano makes a medium cage derailler is for triple ring cranksets, due to the extra chain slack in granny ring. With that in mind go short cage.
Ultegra double it is thanks (nm).tamjam
Oct 5, 2002 8:58 AM