FOX RP23 shock - extend stroke from 2" to 2.25" (50 to 57mm)?-
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  1. #1
    mtbr member
    Reputation: Bro_cro_xc's Avatar
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    Mar 2006

    FOX RP23 shock - extend stroke from 2" to 2.25" (50 to 57mm)?

    Not that I have actual need but I'm curious:

    I realized that my FOX RP23 (non-kashima) shock ETE: 7.875 " (200 mm) and 2" stroke (50 mm) shares the same body as 2.25" stroke version, it's stroke is only limited to first two inches.

    Is there a way to modify shock to use full 2.25 stroke?

  2. #2
    Elitest thrill junkie
    Reputation: Jayem's Avatar
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    Jul 2005
    Not usually a good idea, can case tire rub against the seat tube, metal-on-metal contact with linkages or other parts, etc. It depends on the shock, but usually this can not be done without switching out major parts within the shock, which is usually more expensive than just finding a used (or sometimes even new) shock. It's also very unlikely to find a shop that can order the parts to do this, as the suspension tuners like Push are usually the only ones that have the capability, but again it's switching out parts + service which makes it a very expensive endeavor. If you want an upgrade it's generally a much better idea to either get your current shock tuned with a higher flow piston and shims/valving adjusted to your weight, or a new shock with more sophisticated damping/valving (like Cane Creek CCDB, avalanche shock, BOS, etc).
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

  3. #3
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    Apr 2008
    it's really easy to do in concept, but very difficult in execution.

    When you take the air can off, the main seal housing you see is different between the two eye to eyes. the square section you could put a wrench on is longer on the 2.0 stroke shock so it bottoms out sooner and limits the stroke. The same section is shorter on the 2.25. This is just what I've seen on various fox stuff I've taken apart, it might be different now, or different in your application.

    So, while it would be really easy to swap, you are limited by being able to get the part (fox won't sell it) and you are limited by being able to charge the shock on re-assembly (you need a nitro fill needle and information fox doesn't release to consumers).

    Enjoy your bike the way it is now, or send the shock to a tuner like avalanche or push to get the most out of the travel you've got.


  4. #4
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    Reputation: trailbildr's Avatar
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    Dec 2004
    Plus, the air cans are different for different eye to eye and stroke shocks, so you'll need a new one of those.

    So, short answer: buy a new shock.

    TrailWerks Cyclery
    TrailWerks Suspension Service

  5. #5
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    Reputation: Bro_cro_xc's Avatar
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    Mar 2006
    Thanks guys for quick and informative answers!!!

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