Will it fit? Stumpjumper rear shock replacement - 190 x 42.5 to 190 x 45mm- Mtbr.com
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  1. #1
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    Will it fit? Stumpjumper rear shock replacement - 190 x 42.5 to 190 x 45mm

    I am looking to swap out the factory rear shock on my Stumpjumper, but am not 100% certain if a shock I am looking at is going to fit. The stock unit is a 190 x 42.5mm X-Fusion, it looks like the only direct replacements are a Fox or Cane Creek.

    However, is there a way to figure out if a 190 x 45mm will fit? It's only a 2.5mm difference, which is small, but at the same time I realize that 2.5mm of difference may not work, but if it does it opens up a larger selection that I can choose from to upgrade.

    Is there a way I can measure anything on the bike to confirm if the 190 x 45mm would work?

    Additionally, if I find a used shock that will work can I simply remove the mounting hardware from the factory unit to make the new shock fit? I'd assume yes, but would rather be certain before buying something and then finding it does not work.

    Thanks.

  2. #2
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    The shock will fit since the eye-to-eye is 190mm. With longer stroke, at full compression, the rear wheel might hit the seat tube. Shocks can be fitted with spacers to limit the stroke while keeping the i2i same. Consult the vendor for limiting stroke

  3. #3
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    Thanks, I found this info on another thread as well:

    "You need to pull the shock off and measure the distance between the mounts at full extension and max. compression to find out if a different shock will work for your application. It isn't unheard of, but there can be drawbacks."

    Assuming I am reading this correctly, at full compression my current shock is 147.5mm in length (190 - 42.5mm). If I measure the distance between the mounts on my bike and it is less than 145mm at full compession (190 - 45mm of new shock) without anything hitting, rear wheel hitting seat tube for example, then the 190 x 45mm should fit without issues. I think.

    Update: So, took of the existing shock and let the bike compress fully. The distance between both mounting points (center to center) was 139.7mm, so looks like I have about 8mm to work with. Even fully compressed the rear wheel was not hitting the seat post, looks like a 190 x 45mm should work.

  4. #4
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    This may or may not help, I just bought a LTD Edition Stumpy ST after a demo on the Expert model. The standard ST Stumpy is 120mm and mine is 130mm. From what i could find there is no difference in the length of yoke or linkage so what you discovered is legit.

    Side note...I have a brand new Deluxe RT3 190x45 I could let go for a decent price. if interested shoot me a PM

  5. #5
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    Thanks for the reply, I actually picked up a Fox DPS right before reading your message. Hoping it's a nice upgrade from the stock unit.

    I'll probably list the X-Fusion for sale, but not expecting much interest in it.

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