|Rear Derailleur Compatibility Question||TNSquared|
Jul 27, 2003 5:43 AM
|I'm considering running a double crankset (53/39) with an XT 11-32 rear cassette to give me some easier gears for cyclocross and mountain climbs.
I know an XT rear derailleur will work, but I have an extra Ultegra triple rear derailleur and wonder if it will work since I'm really running a double crank. The specs I found for the Ultegra at a couple of websites indicate that it can handle a max chain wrap of 37t, which is sufficient for my proposed set-up. However, the specs also say that the Ultegra can only handle a max cog of 27t.
So my question is whether the max cog size is really a separate limitation from the chain wrap, or do they just provide this criteria to make it easy for people who really are running a triple crank and don't understand how to calculate chain wrap?
Thanks - todd
|re: Rear Derailleur Compatibility Question||Rusty Coggs|
Jul 27, 2003 6:03 AM
|Max cog and wrap are different specs,based on different design parameters. an ultegra 9 speed RD will usually handle a 30 cog,sometims a 32 depending on application.|
|re: Rear Derailleur Compatibility Question||LC|
Jul 27, 2003 8:26 PM
|Ultegra most likely will not handle 32. I could not even get 30 to work. The top pulley will hit the large cog. 28 maybe 29 is about all you can hope to get to work.|
|Thanks. Guess I'll go with XT to be sure. nm||TNSquared|
Jul 28, 2003 2:08 PM