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Old 12-16-07, 10:04 AM   #1
born2pdl
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Can I use D/A10sp ders with Ult9sp shifters?

Slowly upgrading our tandem from 9-speed ultegra triple to 10-speed. Will 10-speed D/A front and rear deraillures shift correctly if used with my 9-speed ultergra shifters? Has anyone run this kind of combo? Thanks.
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Old 12-16-07, 01:25 PM   #2
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It should. I use 10-speed 105 (5600) derailers with 7-speed RSX brifters. The derailer doesn't control the shifting, the shifter does.
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Old 12-16-07, 02:28 PM   #3
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The rear will work perfectly. You may get some chain rub in the front because the FD is meant for a slightly smaller chain. If the front shifter has a half-shift/trim function, that should help. It should still shift fine though.
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Old 12-16-07, 07:12 PM   #4
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You should be fine
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Old 12-17-07, 10:51 PM   #5
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Thanks guys.
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Old 12-17-07, 11:47 PM   #6
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this might be obvious but - the deraileurs will work as long as you continue running 9 sp cassette.
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Old 12-18-07, 09:35 AM   #7
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Quote:
Originally Posted by JiveTurkey View Post
The rear will work perfectly. You may get some chain rub in the front because the FD is meant for a slightly smaller chain. If the front shifter has a half-shift/trim function, that should help. It should still shift fine though.
+1
It depends on if the crankset and/or chain are 9-speed or 10-speed. You may want to stay with the 9-speed front derailleur until everything is 10-speed.
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Old 12-19-07, 07:02 PM   #8
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Actually, if you upgrade from 9- to 10-speed, the only things you need to change are:
- chain (10-speed chain)
- cassette (10-speed cassette)
- shifters (10-speed shifters).

You don't ever need to change anything else.

Rear derailleurs will shift whatever you present them with, and front derailleurs are fine-tuned to what Shimano considers a "perfect" crankset. Since the 9-speed crankset and the 10-speed crankset have slightly different rings (40 vs 39 middle ring if I remember correctly), the new front derailleurs are shaped slightly differently. So using a 9-speed FD with a 10-speed crankset and STI shifters may result in slight rub on 1-2 extreme combinations.
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Old 12-21-07, 12:39 PM   #9
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Good info. Thanks again.
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