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  1. #1
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    What derailleur do I need?

    I have a new 11-40 10s cassette. But my old slx derailleur is not good for it.
    Do I need to buy a new derailleur? And which one do I need?
    Someone told me I can buy slx 11s derailleur and it will work for 10s. Is it right?
    And do I need sgs or gs?

    Please help...

  2. #2
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    What derailleur do I need?

    The new generation 10spd derailleurs (m6000 deore and m7000 slx) will work.
    Or, like what you were advised, an 11spd derailleur eill work as well. Might be a better option if you decide to go 11spd in future.

    Sent from my iPhone using Tapatalk

  3. #3
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    What is "old", is it a 8 or 9 spd or 10 spd? If it's anything before 10spd, then getting it to work would be more trouble than it's worth, even if you can, if it's a 10spd, all you might need is a longer B_Tension screw or Wolf Tooth GOAT LINK. If you just want a new derailleur, then yes, an 11spd Shimano will work with 10spd shifters for future compatibility in case you move to 11spd.

    If it's only going to a 40t cog, then a medium cage (that's GS) will work fine, but you can use a long cage (SGS) if you want, just a bit closer to the ground and obstacles, but you will have the ability should you choose, to go to a bigger cog next time you replace your cassette. CRC has the 10spd SLX M7000 on sale for $42 US.

    Quote Originally Posted by Netan View Post
    I have a new 11-40 10s cassette. But my old slx derailleur is not good for it.
    Do I need to buy a new derailleur? And which one do I need?
    Someone told me I can buy slx 11s derailleur and it will work for 10s. Is it right?
    And do I need sgs or gs?

    Please help...
    One day your life will flash before your eyes, will it be worth watching??

  4. #4
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    Quote Originally Posted by LyNx View Post
    What is "old", is it a 8 or 9 spd or 10 spd? If it's anything before 10spd, then getting it to work would be more trouble than it's worth, even if you can, if it's a 10spd, all you might need is a longer B_Tension screw or Wolf Tooth GOAT LINK. If you just want a new derailleur, then yes, an 11spd Shimano will work with 10spd shifters for future compatibility in case you move to 11spd.

    If it's only going to a 40t cog, then a medium cage (that's GS) will work fine, but you can use a long cage (SGS) if you want, just a bit closer to the ground and obstacles, but you will have the ability should you choose, to go to a bigger cog next time you replace your cassette. CRC has the 10spd SLX M7000 on sale for $42 US.
    It is 10s slx derailleur. So all I need is to find a longer b screw? I really don't want to spend a lot of money so it's not like I'm looking for excuses to buy a new derailleur.

  5. #5
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    Basically, most times, yes, a longer B-Screw should do the trick to get it to work with a 40t, but depends on which version you have, the older non-clutch or newer clutch style. If the longer B-Tension screw doesn't work, then a WT Goat Link is about $20.

    Did you crank your B screw as far in as possible to see how close it would get to working? Is it trying to get on the 40T at all? Reversing the B screw could work and give you that extra bit if reach to see if it'll work.

    Quote Originally Posted by Netan View Post
    It is 10s slx derailleur. So all I need is to find a longer b screw? I really don't want to spend a lot of money so it's not like I'm looking for excuses to buy a new derailleur.
    One day your life will flash before your eyes, will it be worth watching??

  6. #6
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    Quote Originally Posted by LyNx View Post
    Basically, most times, yes, a longer B-Screw should do the trick to get it to work with a 40t, but depends on which version you have, the older non-clutch or newer clutch style. If the longer B-Tension screw doesn't work, then a WT Goat Link is about $20.

    Did you crank your B screw as far in as possible to see how close it would get to working? Is it trying to get on the 40T at all? Reversing the B screw could work and give you that extra bit if reach to see if it'll work.
    I got the derailleur with the clutch system.
    I already got it to go on the 40t cog but then it won't reach the 11t cog.
    And after some tuning I got it to reach a cogs but no matter what I'll do it will never turn smoothly. If I try to adjust the derailleur either way it will stop reaching the 11t or 40t cogs.

  7. #7
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    I'm running an 11spd XT rear derail on my 10 spd setup. Worked great until I tagged a rock. Strange enough I did not even have to adjust it for my 42T cog. Just mount & go! I'd replace the cable also just because they are cheap. Save the old one for the parts box for a trail side fix.

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