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Old 05-29-07, 07:06 AM   #1
rped
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XTR 9-speed on a 10-speed road bike?

My wife temporarily needs a easier climbing gear for a hilly ride next month. Is it possible to take the 11-32 9 speed cassette and derailleur off of the MTB and put it on the road bike? Ultegra-10 STI shifters /compact crankset. The largest 10-speed cassette I have found to date is 12-27, she may need more. Iw ant to find a way to give her the most "bail out" gearing without switching to a triple. Thanks in advance.
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Old 05-29-07, 07:38 AM   #2
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[redacted*] And unless you reset the dérailleur limits she runs the risk of throwing the chain; the brifter will offer a gear that isn't there.

*Edit: Didn't notice that you proposed to move the dérailleur too. Still the problem w/ the brifters, though.

12-27 with a compact crank is pretty low gearing. Try it and see. If she really needs more then seriously consider a triple.
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Old 05-29-07, 07:44 AM   #3
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No. The rear dérailleur won't handle a 32 cog. And unless you reset the dérailleur limits she runs the risk of throwing the chain; the brifter will offer a gear that isn't there.

12-27 with a compact crank is pretty low gearing. Try it and see. If she really needs more then seriously consider a triple.

The question is whether the nine speed mtb cassette AND XTR derailleur can be switched over. The only problem I see is the indexing of the shifters, but here's a solution to that: http://www.sheldonbrown.com/gloss_aa-l.html#alternate
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Old 05-29-07, 08:07 AM   #4
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IRD makes 10 spd wide range cassettes with 11-34, 12-32 and 11-32. The XTR der will work with the shifters no problem.
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Old 05-29-07, 08:10 AM   #5
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yes I would switch the XTR derailleur and the cassette over to the raod bike. My guess is that a 9 speed chain would have to be installed also for length and to properly fit the cassette and XTR der. My main concern is how the shifting will be. Does a 10 speed STI have a smaller "throw" than a nine speed setup? I could reset the limit screws so it will only go through nine gears but will it shift properly from gear to gear?
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Old 05-29-07, 08:16 AM   #6
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yes I would switch the XTR derailleur and the cassette over to the raod bike. My guess is that a 9 speed chain would have to be installed also for length and to properly fit the cassette and XTR der. My main concern is how the shifting will be. Does a 10 speed STI have a smaller "throw" than a nine speed setup? I could reset the limit screws so it will only go through nine gears but will it shift properly from gear to gear?

See the link I posted to Sheldon's site. The "alternate cable routing" allows the shifters to move the derailleur slightly further with each click, essentially giving you nine speed shifting with ten speed shifters. Set the limit stops of the derailleur as you normally would, there will be no extra click-
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Old 05-29-07, 08:31 AM   #7
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Thanks I checked Sheldons site. Plenty of info. I think I will get her the IRD 32 tooth cassette and run the XTR der. That gets us almost to triple gearing, that should be plenty.
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