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  1. #1
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    Update Sram SX eagle on GX

    I want to update the transmission and replace the Sram SX eagle with the Sram GX eagle, if not all, but at least the rear derailleur and shifters. Dear participants of the Russian bicycle forums and some masters in my city, they said that it is difficult because the GX on the Boost system, the Cannondale Trail 3 frame is such an update that you need to change the wheel and turn a separate hub under the XD drum. I want to know if anyone has updated the SX eagle on the NX eagle or GX eagle?




  2. #2
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    To run a SRAM GX cassette you need an XD driver. I did a quick look and your bike is spec with Shimano MT200 hub but I'm not sure there's an XD driver available. Usually, it's around 75us$ to change the driver.

    To me, I see no reason a GX derailleur and shifter wouldn't work on your bike if you keep the sx cassette or even "upgrade" to Nx cassette which uses the same driver than SX. But I don't own this bike and maybe I'm missing something?
    2015 Salsa Blackborow 1
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    2009 Spec Tricross Sport
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  3. #3
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    Quote Originally Posted by Ponik78 View Post
    I want to update the transmission and replace the Sram SX eagle with the Sram GX eagle, if not all, but at least the rear derailleur and shifters.
    GX Eagle derailleur and shifter is a straight drop in replacement. Go for it!

    Quote Originally Posted by Ponik78 View Post
    ...they said that it is difficult because the GX on the Boost system
    Your frame has Boost spacing on quick-release dropouts. Boost effects the chainline, so if you want to replace the crankset too, just get the "Boost" GX version with its -3mm offset chainring. It looks like you have a 73mm threaded BSA bottom bracket, so get the corresponding DUB bottom bracket:

    https://www.servicearchive.sram.com/...om_bracket.pdf

    Quote Originally Posted by Ponik78 View Post
    ...you need to change the wheel and turn a separate hub under the XD drum. I want to know if anyone has updated the SX eagle on the NX eagle or GX eagle?
    I would run the stock hub with its HG driver and SX cassette (or NX cassette or SunRace cassette) until you decide to get new wheels some day in the future.
    --------------

    [WTB] 1987 Cannondale SM800, 20", Pink with airbrushed graphics.

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