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  1. #1
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    Weird Shifting on my Scalpel

    2011 Scalpel, SRAM X9 RD with Sram cassette. 2X9 Gearing.

    The bike is new to me, and it's my first full suspension bike. In other words, I'm used to a hardtail.
    The rear derailleur is adjusted and shifting crisply, and the chain is properly shortened...
    But, when I'm on the trail and I shift while the suspension is springing up & down, the chain will jump several cogs and even sometimes fall right off the cassette.

    I'm sure this is not normal, what to do?
    "What is this? A center for ants?"

  2. #2
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    I'm thinking it might have something to do with the derailleur length. ie: short/long cage?

    Pics here:My Winter Scalpel Build.
    "What is this? A center for ants?"

  3. #3
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    vid link

    If the chain is coming off the cassette, I'd start with making adjustments to your limit screws, then tune the derailleur from there. There are some pretty good vids out there to walk you through this. Here is a link to help walk you through:
    Technical Tuesday: How To Set Up Your SRAM Rear Derailleur - Pinkbike

  4. #4
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    I adjusted the B Tension screw on the derailleur, hope that helps. Someone suggested a chain tensioner but I can't see anyone putting that on an XC rig.
    "What is this? A center for ants?"

  5. #5
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    I'd suggest that you start by adjusting the high and low limit screws first, before you tinker with the b tension. SRAM recommends 6mm gap between your upper pulley and the cog. If you follow the steps in that video and you still have problems, take it to a shop (unless you have the tool) and have the alignment on your derailleur hangar checked. Also, that's a nice bike you have there!

  6. #6
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    Well, found the problem. Rear derailleur cable/housing was too short. Such a simple solution with huge results.
    "What is this? A center for ants?"

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