RP23 or CTD

Discussion in 'The Workshop' started by joekilabot, Apr 28, 2013.

  1. joekilabot

    joekilabot Member

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    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
     
  2. herzalot

    herzalot Active Member

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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.
     
  3. babu9000

    babu9000 New Member

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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.
     
  4. techryder

    techryder New Member

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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.
     
  5. rschroeder714

    rschroeder714 HAB Crew sweep (slowest)

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    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
     
  6. herzalot

    herzalot Active Member

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    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).
     
  7. templar

    templar New Member

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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.
     
  8. scottywc

    scottywc New Member

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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.
     
  9. eatsrice91

    eatsrice91 NoMoSoCal

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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.
     
  10. solislbc

    solislbc New Member

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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.
     
  11. techryder

    techryder New Member

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    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.
     
  12. eatsrice91

    eatsrice91 NoMoSoCal

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    That says it right there. LOL, I love me some Fox but when you need a backup, makes ya wonder..... :?:
     
  13. scan

    scan Member

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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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