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Old 09-12-12, 09:18 AM   #1
mynameistaken
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Will mountain bike shifters work with a road cassette + RD?

I have a 2004 mountain bike that I am considering turning into a commuter with some spare parts. (Currently 9 speed and heavily worn) Before I start taking everything apart I wanted to know if these parts were compatible.

Shimano 105 RD, 105 12-25 Cassette 10spd with new XT 780 shifter or SLX 10 speed.

I don't own the shifters but might buy them if they are compatible.

Will XT and 105 work OK?
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Old 09-12-12, 09:29 AM   #2
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I have a 2012 Trek 8.5 DS hybrid with XT/SLX shifters and derailleurs and a wide range cassette (SRAM PG950). I recently had my LBS change the cassette to an SRAM PG970 (11-21 road cassette). After a little bit of derailleur adjustment things are good, mush less "crunching", but my LBS did suggest that I change the rear derailleur for something with a shorter arm. I don't know what improvement that would give me, but, we'll see, maybe next year.
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Old 09-12-12, 10:24 AM   #3
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Originally Posted by namtnulb View Post
my LBS did suggest that I change the rear derailleur for something with a shorter arm. I don't know what improvement that would give me
If it works, don't fix it. As long as you're happy with the rear shifting, leave it be.
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Old 09-12-12, 10:28 AM   #4
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Quote:
Originally Posted by mynameistaken View Post
I have a 2004 mountain bike that I am considering turning into a commuter with some spare parts. (Currently 9 speed and heavily worn) Before I start taking everything apart I wanted to know if these parts were compatible.

Shimano 105 RD, 105 12-25 Cassette 10spd with new XT 780 shifter or SLX 10 speed.

I don't own the shifters but might buy them if they are compatible.

Will XT and 105 work OK?
With those shifters, no. The shifters are "Dyna-Sys" compatible, which means you need a Dyna-Sys rear derailleur to make it work. For the 105 rear derailleur and 10-speed, you need not-Dyna-Sys shifters, such as the R770: http://harriscyclery.net/product/sl-...d7013-qc49.htm (note the price).

Are the shifters on the MTB worn out? If they still work OK, it's probably cheapest to replace the chain and cassette with new 9-speed stuff.
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