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  1. #1
    steezy as 123
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    10 Speed Derailleur, 8 Speed cassette

    Would it work if I got a nice new slx or deore xt rear derailleur (dyna-sys) and put it on my 8 speed bike.

    I was thinking it would work because it's the 8 speed shifters that control the indexing, and the derailleur is oblivious to how many gears it is working with.

    Yes, no? Eventually i'll switch it all over to ten speed, i'm just brainstorming here.

    My inspiration ----><a href src="http://www.jensonusa.com/store/product/RD272A00-Shimano+Slx+Rd-M663+Rear+Derailleur.aspx">SLX Rear Derailleur 46% off</a>

  2. #2
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    Edited this post because as pointed out by the next poster I missed a VERY critical exception in Sheldon Browns article pertaining to Dynasis components.

    http://www.sheldonbrown.com/speeds.html
    Last edited by Crash Test Dumby; 06-29-2011 at 08:15 PM.
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    Screw the search function... you're new, ask the question(s). If anyone gets thier undies in a bunch it's thier problem.

  3. #3
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    Quote Originally Posted by Crash Test Dumby View Post
    Yes it would work fine. Some will try to say otherwise, but they are usually epople trying to sell parts. I have posted this link many times, its the late great Sheldon Browns commentary on drive train parts, mixing 7, 8, 9 and 1p speed parts and such.

    http://www.sheldonbrown.com/speeds.html
    This is incorrect, the new 10 speed Dyna-Sys is NOT compatible with previous 7, 8, and 9 speed shifters as well as 10 speed road shifters. The Sheldon Brown article clearly states this.
    Shimano Dyna-Sys 10-speed shifters and derailers use a longer cable pull than other Shimano models, and must be used together.

  4. #4
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    Quote Originally Posted by mtnbiker72 View Post
    This is incorrect, the new 10 speed Dyna-Sys is NOT compatible with previous 7, 8, and 9 speed shifters as well as 10 speed road shifters. The Sheldon Brown article clearly states this.
    My bad, I did miss that detail. Sorry to the OP for missing that VERY critical detail in my response.
    Quote Originally Posted by STT GUY View Post
    Screw the search function... you're new, ask the question(s). If anyone gets thier undies in a bunch it's thier problem.

  5. #5
    steezy as 123
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    Gahh looks like I'll have to wait a bit then... thanks for your help

  6. #6
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    Why would you buy a 10sp der for an 8sp bike? Just doesn't even make sense even if it did work. Shifters have more to do with the performance aspect than the rear der. does.
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  7. #7
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    Just finding this with the search... I also want to use the new stuff with my old 8 speed stuff. I want to use the new shadow clutch XT der. Is that also Dyna-sys?
    Only boring people get bored.

  8. #8
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    10 Speed Derailleur, 8 Speed cassette

    Quote Originally Posted by jh_on_the_cape View Post
    Just finding this with the search... I also want to use the new stuff with my old 8 speed stuff. I want to use the new shadow clutch XT der. Is that also Dyna-sys?
    All Shimano mtb 10-sp is Dyna-Sys and not compatible with anything else.
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  9. #9
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    Quote Originally Posted by shiggy View Post
    All Shimano mtb 10-sp is Dyna-Sys and not compatible with anything else.
    Thanks! Keeps me from a potential upgrade... anything else to improve chain tension? Chain is as short as I can do it, but sometimes in less than ideal chain/cog when I ratchet up something the chain goes a little slack then I slam forward taking up the slack.
    I should go with a shorter cage der if possible? B-screw?
    Only boring people get bored.

  10. #10
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    Quote Originally Posted by jh_on_the_cape View Post
    Thanks! Keeps me from a potential upgrade... anything else to improve chain tension? Chain is as short as I can do it, but sometimes in less than ideal chain/cog when I ratchet up something the chain goes a little slack then I slam forward taking up the slack.
    I should go with a shorter cage der if possible? B-screw?
    Work on your gearing choices. You can't buy your way out being in the wrong gear.
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  11. #11
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    For compatibility, I also don't know...

  12. #12
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    10 Speed Derailleur, 8 Speed cassette

    Quote Originally Posted by jh_on_the_cape View Post
    Thanks! Keeps me from a potential upgrade... anything else to improve chain tension? Chain is as short as I can do it, but sometimes in less than ideal chain/cog when I ratchet up something the chain goes a little slack then I slam forward taking up the slack.
    I should go with a shorter cage der if possible? B-screw?
    That does not sound like a chain tension problem. Just abusive technique.
    mtbtires.com
    The trouble with common sense is it is no longer common

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