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Ultegra / XT compatibility(7 posts)

Ultegra / XT compatibilitycharlieben
May 2, 2002 10:40 PM
I am building up a cross bike with Ultegra STI shifters, 105 48/39 cranks, and am considering an ultegra rear derailler with 12-27 ultegra or 12-34 XT cassette. Will the 12-34 be compatible with the derailler, and will I need to get a short or long cage. I ride in an area with some relatively steep climbing. Any thoughts and advice appreciated...
re: Ultegra / XT compatibilityAlpedhuez55
May 3, 2002 8:32 AM
I have used both a long and short cage XT with my 8 speed 105 shiters/Levers on mt Surly without a problem. I run a 105 Front triple crank and deraileur and the XT in the rear 12-26 cassette. The short cage seems to work well. If you are using the 12-34 you would want to use a long cage.
re: Ultegra / XT compatibilityturtlemoye
May 3, 2002 9:45 AM
If I understand your question correctly "Can you use an ultegra r. der with a 12/34 cassette" the answer is no. The largest cog a 9 speed ultegra r. der. will accept is a 12/27. I run ultegra shifters with an XT r. der. and can run just about any size cassette. I don't know wher you live but I doubt that you will need a 34 tooth cog anyway.

Good luck,
re: Ultegra / XT compatibilityatpjunkie
May 3, 2002 12:06 PM
yea, if ya want a 12-34 ya gotta go MTB derailleur. Get a 12-27, any steeper of a hill and you should probably be running. My "adventure bike" runs a triple w/ 12-27 if I need a lower gear I have the granny ring.
re: Ultegra / XT compatibilitycharlieben
May 3, 2002 9:25 PM

Thanks for your reply. Do you run a long or short cage XT rear der.? Would the short work with a 34 rear?

re: Ultegra / XT compatibilityatpjunkie
May 4, 2002 3:47 PM
you'll need long cage for a 34 I'm 99% sure on that. Run XTR w/ Ultegra 12-27 works wonders. I don't think you are going to need a 34 in the back. If you want a low gear set it up as a triple.
re: Ultegra / XT compatibilityturtlemoye
May 5, 2002 8:16 PM
Sorry for the delay, I am using a long cage r. der. As other posters have mentioned, if you are racing 'cross you will not need anything larger than a 27 or 28....if you are in that low of a gear you need to be running. On the other hand if you just want a do anything bike then I guess it would make sense. You could also run MTB cranks with a 36/46 or 36/48 and run a smaller road cassette(road der. of course) which will give you better shifting b/c the difference in the number of teeth is less drastic compared to an 11-28 or 12-34.

Good luck,