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Thread: RP23 or CTD

  1. #1
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    Default RP23 or CTD

    I'm planning on replacing my stock rear shock on my 09 Stumpy but I just don't know which one to get. Any input would be greatly appreciated.

    Thanks,
    Joe

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    STR Veteran herzalot's Avatar
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    Not a Fox. I am not sure how many options you have however, because I believe Speshy uses unique eye-to-eye length and stroke.

    I had a 2013 CTD on my new Endorphin, and it was pretty good. It was equal to if not better than the RP23. Most suspension geeks will tell you there are better shocks on the market from X-Fusion, Rock Shox, Cane Creek and Marzocchi.
    "To me, winning isn't, you do" Ty Webb to Danny (Caddyshack)
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    +1 on specialized using funky shock lengths. I am RockShox convert. The Monarch RT3 is a great shock. I also have an Ario, which is the stripped down version of the Monarch but uses the same body (kinda like Float RP23 vs Float R). Both have been trouble free.
    What shock is on your bike now. I thought Stumpy's came with a Fox rear shock already?

    What is the difference between CTD and any other shock? Didn't the RP23 already kinda have those settings? The Monarch RT3 has had that locked, mid setting and wide open setting for a while now. Just seems like more marketing BS.

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    another +1 on Speshy shock lengths. http://www.specialized.com/us/en/bikes/archive/2009/stumpjumperfsr

    26" 2009 stumpy uses 7.25" x 1.75" shock
    29" uses 7.25" x 1.5" shock

    I've wondered what are the differences with the various versions of the fox air shocks. Here's what I found out.

    RP2 - 2 position pro-pedal, off/on
    RP3 - 3 position pro-pedal, off/light/firm
    RP23 - 4 position pro-pedal, off/light/medium/firm
    CTD - 3 position compression dampening firm/medium/light or off

    So the standard Float CTD is really similar to the RP3.

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    HAB Crew sweep (slowest) rschroeder714's Avatar
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    Quote Originally Posted by techryder View Post
    another +1 on Speshy shock lengths. http://www.specialized.com/us/en/bikes/archive/2009/stumpjumperfsr

    26" 2009 stumpy uses 7.25" x 1.75" shock
    29" uses 7.25" x 1.5" shock

    I've wondered what are the differences with the various versions of the fox air shocks. Here's what I found out.

    RP2 - 2 position pro-pedal, off/on
    RP3 - 3 position pro-pedal, off/light/firm
    RP23 - 4 position pro-pedal, off/light/medium/firm
    CTD - 3 position compression dampening firm/medium/light or off

    So the standard Float CTD is really similar to the RP3.
    My 09 trance uses the same length and yes it is a pain to find one that size but I ended up using a 7.5x2 fox dhx air 5.0 works great so far.


    Sent from my SPH-L710 using Tapatalk 2

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    STR Veteran herzalot's Avatar
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    Quote Originally Posted by techryder View Post
    another +1 on Speshy shock lengths. http://www.specialized.com/us/en/bikes/archive/2009/stumpjumperfsr

    26" 2009 stumpy uses 7.25" x 1.75" shock
    29" uses 7.25" x 1.5" shock

    I've wondered what are the differences with the various versions of the fox air shocks. Here's what I found out.

    RP2 - 2 position pro-pedal, off/on
    RP3 - 3 position pro-pedal, off/light/firm
    RP23 - 4 position pro-pedal, off/light/medium/firm
    CTD - 3 position compression dampening firm/medium/light or off

    So the standard Float CTD is really similar to the RP3.
    That's not quite right. RP23 has a two position Pro Pedal lever - on or off (thus the 2). Within that, you can pre-select from 3 levels of firmness for the ProPedal - thus the 3. In other words, you can pre-determine how firm the Pro Pedal function will be when you use it.

    The CTD is similar. It could be called an RP33. On mine, I could pre-select one of three levels of firmness for the Trail mode. Then, on the fly, I can use the lever in one of 3 positions - Closed (Climb - locked out), Trail (with my pre-selected firmness) and Open (Descend).
    "To me, winning isn't, you do" Ty Webb to Danny (Caddyshack)
    "Young lady, in this house we will obey the laws of thermodynamics." - Homer to Lisa after she invents a perpetual motion machine

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    Senior Member templar's Avatar
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    I was considering upgrading my rear shocks on my old bike '09 Specialized XC. Ran into the same problem of the custom shock length and did some research and this was the solution I came up with after talking to the tech's at the Path. If CTD is the shock you want, make sure you get the shock that matches the eye to eye length (i.e. 7.25"), then take that shock (if you did not buy it at the Path) and have them reduce the travel/stroke to 1.75".

    I sold the bike and never pulled the trigger on the upgrade.

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    I have a fox RP3 that came with my Heckler. It works, but its on my list to upgrade. I have yet to figure out what the 'trail' setting is for. I either have it locked out for climbing, when I remember, or wide open for everything else.

    For my money there are better options then Fox. Their stuff is over priced.

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    I've had the 2012 RP23 for about a yr now. I like it, but I'm still looking for more if that makes sence? The PP doesn't seem to respond as well as the "pre 12" RP23's did, before the boost valves were introduced. End of the day, I like fox for their simplicity and ease of repair BUT that doesn't mean I wouldn't try another brand.

    My .02, run what you know and try a few different bikes out with different shocks.
    The grass IS greener on the other side!

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    I upgraded/swapped my AFR Brain on an 09 Stumpjumper to an RP23 with boost valve that came off of a Giant. Same eye to eye. The small bump compliance is much better now. Very happy.

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    Quote Originally Posted by herzalot View Post
    That's not quite right. RP23 has a two position Pro Pedal lever - on or off (thus the 2). Within that, you can pre-select from 3 levels of firmness for the ProPedal - thus the 3. In other words, you can pre-determine how firm the Pro Pedal function will be when you use it.

    The CTD is similar. It could be called an RP33. On mine, I could pre-select one of three levels of firmness for the Trail mode. Then, on the fly, I can use the lever in one of 3 positions - Closed (Climb - locked out), Trail (with my pre-selected firmness) and Open (Descend).
    You must have the Float CTD Boost valve w/trail adjust.

    I have an RP23 and a regular Float CTD as a back up shock.

  21. #12
    NoMoSoCal eatsrice91's Avatar
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    Quote Originally Posted by techryder View Post
    I have an RP23 and a regular Float CTD as a back up shock.
    That says it right there. LOL, I love me some Fox but when you need a backup, makes ya wonder.....
    The grass IS greener on the other side!

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    FWIW I think the RP23 will give a little more adjustability on the firmness settings. Never used a CTD shock but from what somebody else described, the degree of firmness is not as adjustable. I miss that feature, currently have a DRCV shock , which is awesome, but sometimes I wish I could firm up the lockout more.

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