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Old 08-30-12, 03:30 PM   #1
mbtigger
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conflicting reports on 10 speed derailleur - set me straight.

I just ordered a 9 speed shimano compatible brake lever shifter set and the 10 speed Shimanho 105 rear derailleur thinking I could adjust the derailleur to fit pretty much any gearing as long as the shifter and gears match. But I have been reading that one cannot use the 10 speed derailleurs with the normal 7/8/9 speed shifters and cassettes. I have read opinions BOTH ways, that one CAN and one CANNOT. Which is it? Please remove this confusion from my brain....

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MB
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Old 08-30-12, 03:40 PM   #2
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anything marked dynasys must be used with dyna sys parts. your plan should work fine
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Old 08-30-12, 03:49 PM   #3
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All non dynasys (Which is a mountain bike thing) SIS RDs should be compatible, at least as far as travel goes. I have had bad luck using some pre-SIS8 RDs, but that could be due to other factors.

A 105 RD should work fine with 9 speed shifters, and many bikes were sold with 9 speed Tiagra and 105 RDs.

It is possible there some some variation in cage width, since 10 speed chains are narrower, but it shouldn't cause issues with 9 and 10 speed components. 8 and 10 maybe, but I'm not sure.
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Old 08-30-12, 04:37 PM   #4
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The 10s 105 derailer will work fine with 9s chain and shifters.
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