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  1. #1
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    Sram x9 9 spd see with wide cassette

    Hi all,

    Am looking to revitalize an old bike, I have a sram x9 9spd derailleur and shifter, I am looking at the sunrace m990 11-40 cassette. Would I just need to get a longer b tension screw? I know that itís not designed for such a big cassette, has anyone had a go before?

    Cheers,

    C
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  2. #2
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    Iíll add that it is a long cage derailleur If that helps. Would a roadlink from wolftooth help?

    C

  3. #3
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    When adding an extended range cassette on an 8 or 9spd system, a derailleur extension works better than a longer B screw, IMO.
    I've tried longer B screws in the past but shifting is a lot smoother when using a hanger extension.
    I just use the cheap $4 Chinese ones off of Aliexpress or you can go with the WolfTooth Roadlink chuggboy suggested.

    2017 Evil Following MB(primary trail bike)
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    2017 Specialized Turbo Levo
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    2012 Canfield Jedi
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  4. #4
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    I have a SunRace CSMS3 11-40 on a stock x9 rear der. Works no problem.
    Haven't tried but it looks like the b screw has enough adjustment for a 42 cassette as well.

  5. #5
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    Quote Originally Posted by UEDan View Post
    I have a SunRace CSMS3 11-40 on a stock x9 rear der. Works no problem.
    Hey UEDan, is your X9 a 9 speed derailleur?
    I had to use the derailleur extension on my wife's bike w/ her SRAM x7 9-speed derailleur - otherwise, it just wouldn't clear the 40T even at it's max (stock) b-screw limit.

    2017 Evil Following MB(primary trail bike)
    2017 Chiner 29er
    (XC-race bike)
    2017 Specialized Turbo Levo
    (party bike)
    2012 Canfield Jedi
    (DH bike)
    2015 Motobecane Sturgis Bullet
    (fatbike)
    2011 Raleigh Renevio (roadie)
    2011 Giant Reign



  6. #6
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    Reputation: frdfandc's Avatar
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    I installed the Sunrace wide range cassette on my wife's bike. It has the X5 9 speed derailleur. No issues engaging the big gear.

  7. #7
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    Crap, 9 speed? Misread the title. 10 speed here. Sorry!

  8. #8
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    Hi, thanks for the replies, I might give it a go and worst case I get an extender for a few bucks.

    Thanks to all.

    C

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