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  1. #1
    Is this gonna hurt? MaxBrokeAway's Avatar
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    Rear Shock PSI loss

    Hey buddies,

    I would like to know from you guys what the "norm" or "average" PSI loss is in the rear shock in relation to use...I know if i pump it to 115 its not going to stay at 115 forever.

    I pumped my shock up last Saturday, and I have probably put about 20 miles on it give or take a few, of variable condition riding - about half and half hard and easy...Here it is Thursday, I check my PSI and it looks like I might have lost 2 to 5 PSI (my shock pump blows off around 7 - 10 PSI when removing it from the shock...so I filled it up to about 127 PSI...and when I checked it today it was right at 115 PSI)...my sag is normally right at a 1/4 inch and today it was about 1 or 2mm more than that...im probably being anal about it, but for future reference I would just like to know what is the "normal" amount of PSI to be lost in a given amount of time/milage...Hope this post wasn't too confusing...

    Thanks!
    Myidolis Says: "clickety flickety? Well i have no idea what your bikes problem is, but your description probably contains the most onomatopoeia i've seen in awhile."

  2. #2
    one less horse cryptid01's Avatar
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    Quote Originally Posted by MaxBrokeAway View Post
    Hope this post wasn't too confusing...
    I am confused as to why you're concerned with a possible 2-5 PSI loss when your measurements fall within an estimated 3 PSI range.

    Now leave it alone and don't check it again until you actually feel a difference while riding.

  3. #3
    one less horse cryptid01's Avatar
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    Oh, and how long is your shock stroke? 1/4 inch doesn't sound like nearly enough sag.

  4. #4
    Is this gonna hurt? MaxBrokeAway's Avatar
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    its what my LBS recommended im not sure of my stroke...its a rockshox Ario 2.R set at 4 inches of travel if that helps
    Last edited by MaxBrokeAway; 08-16-07 at 07:34 PM.
    Myidolis Says: "clickety flickety? Well i have no idea what your bikes problem is, but your description probably contains the most onomatopoeia i've seen in awhile."

  5. #5
    bac
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    Senior Member bac's Avatar
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    Quote Originally Posted by MaxBrokeAway View Post
    im probably being anal about it, but for future reference I would just like to know what is the "normal" amount of PSI to be lost in a given amount of time/milage...Hope this post wasn't too confusing...

    Thanks!
    Hey MaxBA. Yes, some shocks will lose air between rides, and it's pretty normal and nothing to worry about unless it's a large amount in a short time. Just check your air pressure before every ride, and refresh as needed. My Progressive used to lose air between rides, but was a great shock. The Fox stuff I now run rarely lose air though.

    ... Brad

  6. #6
    one less horse cryptid01's Avatar
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    Quote Originally Posted by MaxBrokeAway View Post
    its what my LBS recommended im not sure of my stroke...its a rockshox Ario 2.R set at 4 inches of travel if that helps
    Use your micrometer (or whatever it is you're employing above to determine your sag to the millimeter) and measure the exposed shock shaft. Per Rock Shox website, it'll be either 1.5 or 2.0 inches. Take 15-30% of that number, and that's how much sag you should be running. Feel free to experiment and see what feels good to you. Remember that if your shock is not bottoming occasionally, you're wasting travel.

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