TranceX shock really 7.25" x 1.75"?? Can someone verify?- Mtbr.com
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  1. #1
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    TranceX shock really 7.25" x 1.75"?? Can someone verify?

    The Giant website says the TranceX uses a 7.25" x 1.75" rear shock which is a very unusual size. Can someone (Giant dealer?) verify the I2I and stroke? Hopefully it is just a misprint in the Giant documentation. I am thinking about getting a TranceX frame but there are no aftermarket shocks available in that size, which would limit one to the stock shock from now to eternity.

  2. #2
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    Quote Originally Posted by henryl
    The Giant website says the TranceX uses a 7.25" x 1.75" rear shock which is a very unusual size. Can someone (Giant dealer?) verify the I2I and stroke? Hopefully it is just a misprint in the Giant documentation. I am thinking about getting a TranceX frame but there are no aftermarket shocks available in that size, which would limit one to the stock shock from now to eternity.
    Curious what you came up with here.

    I have a bike I switched to that sized shock, and the three after market shocks I own in that size are a Fox Float R, and Vanilla R, and a Swinger 4-way Air. None are made anymore, but they are still floating around out there as old-new stock.

  3. #3
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    Don't despair...

    7.25" X 1.75" can be got from a 7.5" X 2", inserting a 1/4" spacer between the damper's main piston and seal head.

    It's open heart surgery, but on a Swinger, Roco Air, 5th Air or even a DHX, should be easy cake. Any damper not N2 loaded like a Vanilla, Float, Monarch, etc. will be a no go.

    Push can reduce do that mod and Zoke could do it too.
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  4. #4
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    Quote Originally Posted by henryl
    The Giant website says the TranceX uses a 7.25" x 1.75" rear shock which is a very unusual size. Can someone (Giant dealer?) verify the I2I and stroke? Hopefully it is just a misprint in the Giant documentation. I am thinking about getting a TranceX frame but there are no aftermarket shocks available in that size, which would limit one to the stock shock from now to eternity.
    I could measure the shock on the Trance X on our floor tomorrow, but the strange i2i and stroke length is probably correct. A more normal size they used for the regular Trance, but I imagine that bumping travel to 5" with the Maestro design required using a less common size.

    No other shocks available in the required size? Well, maybe consumers should have thought about that before they began demanding Giant make the Trance a 5" travel bike. The 4.2 version was always awesome and didn't "need" more travel. But the Fox RP23 is a great shock, anyway, so I'd be perfectly happy with the stock shock.
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  5. #5
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    Quote Originally Posted by Warp
    Don't despair...

    7.25" X 1.75" can be got from a 7.5" X 2", inserting a 1/4" spacer between the damper's main piston and seal head.

    It's open heart surgery, but on a Swinger, Roco Air, 5th Air or even a DHX, should be easy cake. Any damper not N2 loaded like a Vanilla, Float, Monarch, etc. will be a no go.

    Push can reduce do that mod and Zoke could do it too.
    You sure about this? I asked Manitou about the Swinger 4-Way air, and Fox about any of their 7.5" x 2" shocks, and they both said it could not be done. Of course that does not always mean it can't be done, just that they don't want to be responsible for it.

    When you say DHX, do you mean air as well as coil?

    Could you explain the "N2 loaded" part?

  6. #6
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    Quote Originally Posted by kapusta
    You sure about this? I asked Manitou about the Swinger 4-Way air, and Fox about any of their 7.5" x 2" shocks, and they both said it could not be done. Of course that does not always mean it can't be done, just that they don't want to be responsible for it.

    When you say DHX, do you mean air as well as coil?

    Could you explain the "N2 loaded" part?
    I think they don't want to be responsible for it. If you put a 1/4" plastic ring between the piston and seal head, you limit the piston extending back to 2" and shorten the effective lenght by 1/4" too.

    As for the DHX, I THINK both. Both are filled with an air pump, through a Schrader valve, so they should be serviceable at home and hence, you could modify them in this way.

    N2... that's nitrogen. On some shocks like the Float series (Float, RP3, RP2, RP23) and Vanilla the Internal Floating Piston which acts like a separating membrane between the gas and the oil inside the damper and that provides a medium to allow for volume changes and keeps the oil from cavitation, is filled through a rubber membrane which you pinch with a needle (think, like a syringe but you put gas in instead of a liquid).

    This requires more specialized equipment. If you're using Nitrogen, you need the N2 tank/cylinder and some regulators, along with the needle and a fresh membrane (it's just a small rubber piece, nothign really special about it)... or at least a shock pump like the one that you can get from Risse Racing (pretty much just a standard pump with the needle and doesn't cost much).

    On shocks with a Schrader or any other kind of fitting (Zoke uses a Zoke Air Adapter to fill their Roco Air shocks), this is totally troublefree. Easy to do at home.
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  7. #7
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    Quote Originally Posted by Warp
    I think they don't want to be responsible for it. If you put a 1/4" plastic ring between the piston and seal head, you limit the piston extending back to 2" and shorten the effective lenght by 1/4" too.

    As for the DHX, I THINK both. Both are filled with an air pump, through a Schrader valve, so they should be serviceable at home and hence, you could modify them in this way.

    N2... that's nitrogen. On some shocks like the Float series (Float, RP3, RP2, RP23) and Vanilla the Internal Floating Piston which acts like a separating membrane between the gas and the oil inside the damper and that provides a medium to allow for volume changes and keeps the oil from cavitation, is filled through a rubber membrane which you pinch with a needle (think, like a syringe but you put gas in instead of a liquid).

    This requires more specialized equipment. If you're using Nitrogen, you need the N2 tank/cylinder and some regulators, along with the needle and a fresh membrane (it's just a small rubber piece, nothign really special about it)... or at least a shock pump like the one that you can get from Risse Racing (pretty much just a standard pump with the needle and doesn't cost much).

    On shocks with a Schrader or any other kind of fitting (Zoke uses a Zoke Air Adapter to fill their Roco Air shocks), this is totally troublefree. Easy to do at home.
    So, tell me if I understand this correctly: The nitrogen chamber serves the purpose of expanding and contracting to allow for volume changes in the shock fluid reservoir due to shaft movement. This chamber is separated by some membrane, I assume to keep the gas from mixing with the oil and getting in the damper? And the reason that shocks with an air chamber such as the swingers, 5th elements, dhx's, and some roccos don't have nitrogen is because the air chamber that you pressurize with air serve the same purpose (in addition whatever dampening function they serve). Is the reason they use nitrogen because it leaks less than air (even though air is mostly nitrogen gas)?

  8. #8
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    Quote Originally Posted by kapusta
    So, tell me if I understand this correctly: The nitrogen chamber serves the purpose of expanding and contracting to allow for volume changes in the shock fluid reservoir due to shaft movement. This chamber is separated by some membrane, I assume to keep the gas from mixing with the oil and getting in the damper? And the reason that shocks with an air chamber such as the swingers, 5th elements, dhx's, and some roccos don't have nitrogen is because the air chamber that you pressurize with air serve the same purpose (in addition whatever dampening function they serve). Is the reason they use nitrogen because it leaks less than air (even though air is mostly nitrogen gas)?
    Exactly...

    It's not really a membrane... Actually it's a piston. Sorry for being misleading. It's often called a "puck" too... And it just separates gas from oil. Avoids emulsification, especially if air is used (keep reading).

    Yes, Nitrogen is not really necessary on a MTB.

    Biggest difference would be that N2 is a dry gas, and air always has some humidity (water in it). As the pressure raises, you could liquefy the moisture and get water.... Water is not further compressible and could be even corrosive to the internals!! No good!!!

    Fortunately, the pressure range used in a typical MTB shock, makes no difference as to use N2 or air.

    Here's the innards of a Roco Air. To be clear. There's no reason why you can't do that mod at home to one of those.

    Roco IFP or "puck"

    <a href="https://www.flickr.com/photos/[email protected]/2032771508/" title="Roco IFP02 by Warpo, on Flickr"><img src="https://farm3.static.flickr.com/2229/2032771508_241fbeea09.jpg" width="500" height="375" alt="Roco IFP02" /></a>

    Home serviceability.... Using a Zoke air valve adapter.

    <a href="https://www.flickr.com/photos/[email protected]/2031970531/" title="Roco IFP06 by Warpo, on Flickr"><img src="https://farm3.static.flickr.com/2252/2031970531_c9e528b38b.jpg" width="500" height="375" alt="Roco IFP06" /></a>

    See the drilled plate close to the piston (far right on the pic)?? Just remove the piston and insert something there 1/4" tall to get a "Trance Approved" shock.

    <a href="https://www.flickr.com/photos/[email protected]/1898210666/" title="Roco Damper01 by Warpo, on Flickr"><img src="https://farm3.static.flickr.com/2355/1898210666_72c5c3556e.jpg" width="500" height="375" alt="Roco Damper01" /></a>

    Difference with "non serviceable" shocks??
    See this cap (pentagonal)?? Under it, there's the IFP filling valve where you thread in the air adapter.
    On a Fox, there isn't something you can thread a pump to. For the sake of clarity, you inflate them though a valve pretty much like the one on footballs.

    <a href="https://www.flickr.com/photos/[email protected]/1675132003/" title="Roco_ by Warpo, on Flickr"><img src="https://farm3.static.flickr.com/2205/1675132003_9501356b64.jpg" width="500" height="375" alt="Roco_" /></a>

    Here's the tool for the job... See the needle on the tip.
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  9. #9
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    just measured the shock...7.25x1.75 does appear correct.
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  10. #10

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    Physically it's possible to change stock shock on tranceX for fox float rp23 7.5x2.0.
    But what kind of troubles should I expect after such operation?

  11. #11
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    What I want is a 7.25" X 2" stroke....
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  12. #12
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    Quote Originally Posted by rideit View Post
    What I want is a 7.25" X 2" stroke....
    Piggyback shock

  13. #13
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    Well, if you can get me that shock for ~$150, (no shock should really be much more that that wholesale, I think) you have a sale!
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  14. #14
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    Quote Originally Posted by 'size View Post
    Does Avy still make shocks???
    Ruder than you.
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  15. #15
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    Some information from the past. (2009, I think)


    Quote Originally Posted by PUSHIND View Post
    Hey guys/gals,

    I was just reading through this post regarding the shock info for this bike. Two things, 1. we do offer our Factory Tuning System for the stock shock if you're looking for improved performance. 2. We will be offering a custom replacement Rock Shox Monarch for this bike after the first of the year. It will also feature our Factory Tuning System with Big Hit Kit and will be custom configured and built to order. Pricing and delivery information will be available shortly.

    Thanks,

    Darren

    Quote Originally Posted by Noobi-Wan Kenobi View Post
    08 X2

    No complaints here.


    Edit w/info-----Cane Creek offers a Cloud Nine (85ST) shock that is 7.28"X1.77" (185mmX45mm) for $345.00 that might work. Stock Fox is 7.25"X1.75". I've not heard of anyone trying a different size shock but this Cloud Nine is really close. I think what PUSH is going to offer is probably the best way to go, depending on price. On the other end I have heard of people using a 140mm fork and lovin' it.
    Originally Posted by Vtolds/Dremer03---- "assume any bikes left unlocked and unattended are free to take"

  16. #16
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    On the PUSH website they list Monarchs for sale at 7.25 x 1.75, so I think whatever issue regarding availability there may have been in the past is likely a moot point now

  17. #17
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    Is it Physically possible to change shock rp22 7.25 X 1.75 on tranceX for fox float rp23 7.5x2.0 ?
    and if it is possile what kind of troubles should I expect after such operation?

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