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  1. #1
    Happy when not-last.
    Reputation: MinskyBA's Avatar
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    Idea! Post your pressure, graph to follow.

    I'd like to collect as much data as possible to make a purdy graph of rider weight vs. pressure for each riding style.

    Please reply to this with the following information:
    * weight including gear
    * pressure in your rear...shock
    * style: light (XC), medium (AM), aggressive (DHish)

    Naturally, I'll post the graph once I have enough data.
    All your base are belong to ME.

  2. #2
    mtbr member
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    200lbs with gear
    185lbs of pressure in rear shock
    AM style riding

  3. #3
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    Since I'm kind of a data nerd, I thought I would lend a hand as I would like to see what kind of results this will produce.

    To make the data collection a bit easier, you can enter your information on this form:
    https://spreadsheets.google.com/view...Z0VIZmZoSlE6MA

    The spreadsheet containing the information can be found here along with the graph:
    http://spreadsheets.google.com/pub?k...JQ&output=html

  4. #4
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    about 180 pounds run about 160 PSI, about %30 sag, am/trail riding
    Last edited by Yody; 04-06-2010 at 11:15 AM.

  5. #5
    boardguru
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    180 pounds, run 160 PSI.
    AM, trail riding.
    25-30% sag

  6. #6
    aka übermensch
    Reputation: Triple T's Avatar
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    195 lbs with gear
    145 psi-DT Swiss shock
    25% +/- sag
    XC riding
    08 Ibis Mojo SL
    09 Ibis Tranny SingleSpeed

  7. #7
    DWlink Fanboy
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    150 lbs
    120 lbs in RP23
    AM riding

  8. #8
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    I already entered this in the form, but here it is again.

    165 lbs
    150 psi, 25% sag
    AM

  9. #9
    Ride More Work Less
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    190lbs
    165psi RP23 Medium tune
    AM
    Last edited by avam; 04-06-2010 at 08:27 PM.

  10. #10
    Happy when not-last.
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    Excellent!

    NEED MORE INPUT!
    All your base are belong to ME.

  11. #11
    mtbr member
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    170lbs
    135psi RPL, 130psi BV RP23
    XC

  12. #12
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    180 lbs w/out camelback
    2010 BV RP23 at 150psi
    AM in Norcal

  13. #13
    mtbr member
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    170 lbs fully loaded
    150 psi Fox RP23 pushed
    Trail / All mountain 25% sag

  14. #14
    Sponge Brain
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    185-190lbs
    165 psi RP23
    Colorado AM and XC

  15. #15
    mtbr member
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    225lbs
    210psi
    RP23
    AM

  16. #16
    mtbr member
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    190lb With Camelback
    170psi
    RPL
    25%-30% sag
    XC&AM

  17. #17
    aka dan51
    Reputation: d-bug's Avatar
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    210lbs
    230PSI
    AM riding

    *note, I just got another shock pump, and the reading on it is totally different. So my 230 may actually be lower...
    Last edited by d-bug; 04-07-2010 at 09:01 AM.

  18. #18
    mtbr member
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    145lbs
    115 psi on RP23
    XC/AM

  19. #19
    mtbr member
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    Aggressive XC / light AM
    175lbs w/ 3.0L camelbak
    145 psi

  20. #20
    mtbr member
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    155 Lbs-165 Lbs with gear and pack
    140 Psi
    2009 RP23
    XC/light AM

  21. #21
    mtbr member
    Reputation: getbusyliving's Avatar
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    165 w/ gear
    150 psi (PUSH tuned RP23)
    XC & AM & occasional DH shuttle/lift assisted

  22. #22
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    210-215 lbs 190/195 rp23 aggressive xc/am

  23. #23
    mtbr member
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    165 w/ gear
    150 psi RP23
    XC/AM

  24. #24
    Garth Brooks & Dun Rulz!
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    190 fully loaded
    170psi - 2010 RP23 w/BV
    Trail / Wisconsin AM

  25. #25
    YRTRNRSHVY
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    Quote Originally Posted by MinskyBA
    I'd like to collect as much data as possible to make a purdy graph of rider weight vs. pressure for each riding style.

    Please reply to this with the following information:
    * weight including gear
    * pressure in your rear...shock
    * style: light (XC), medium (AM), aggressive (DHish)

    Naturally, I'll post the graph once I have enough data.
    180-185lb with gear
    145-150psi
    light/medium

  26. #26
    Founder: Dirty3hirties
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    Quote Originally Posted by mojobeer
    170 lbs fully loaded
    150 psi Fox RP23 pushed
    Trail / All mountain 25% sag

    Ditto

  27. #27
    Happy when not-last.
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    MOOOOOOOOOOOOOOOooore input!
    Keep it coming!

    I'll post the graph when it goes a day or two without replies.
    All your base are belong to ME.

  28. #28
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    This is awesome as this is good starting points for dialing in the suspension. Maybe start one also for the fork Fox 15mm 32 RL, DT Swiss, Lyric, Fox 36 etc.

  29. #29
    mtbr member
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    155
    125 Rp23
    Xc/am

  30. #30
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    235lb with gear
    215
    XC/AM

  31. #31
    meh
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    200 lbs
    180 psi (Med Tune RP23)
    XC/AM

  32. #32
    Happy when not-last.
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    Results

    The Results are in!

    The averages are:
    XC: 84%
    AM: 87%
    DH: 90%

    ...that's a good starting point, but we can do better.
    XC: psi = [weight * 0.92] - 12.5
    AM: psi = [weight * 1.07] - 36.4
    DH: psi = [weight * 0.68] + 37.5


    Here's the data if anyone's interested.
    https://spreadsheets.google.com/ccc?...UTUQzX3c&hl=en
    Attached Thumbnails Attached Thumbnails Post your pressure, graph to follow.-mojo-pressure-graph.jpg  

    All your base are belong to ME.

  33. #33
    flow where ever you go
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    Quote Originally Posted by MinskyBA
    The Results are in!

    ...that's a good starting point, but we can do better.
    XC: psi = [weight * 0.92] - 12.5
    AM: psi = [weight * 1.07] - 36.4
    DH: psi = [weight * 0.68] + 37.5
    ]
    Nice Work!!

    "I must not be crazy because I'm seriously questioning my sanity"

  34. #34
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    Thanks for putting all this together. Very helpful!
    功夫大师喜欢骑着他的自行车在山上。

  35. #35
    screamer
    Reputation: budgie's Avatar
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    dumb question

    Hey, sorry to resurrect an old thread, especially with a dumb question, but here goes: I assume these shock pressures everyone is posting are the resting pressures once the pump is attached (as opposed to when air is added to the shock)? In my experience when adding air to a shock about 5psi is "lost" -- presumably from the hose, valve, etc. -- when the pump is detached and you hear that "pssht." Of course it's not lost from the shock itself, but rather from the pump and fittings. Over the years this has been the case on many different shocks, with many different pumps. So for the purposes of consistency's sake in this database we're talking about the first case, right? Pressure that reads once the pump is first attached?

    Just want to make sure I'm comparing apples to apples here... still trying to find my own sweet spot and this info is a helpful benchmark!
    On heavy rotation: White Lung: Deep Fantasy

  36. #36
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    When the pump is disconected from the shock there should be no air lost as the gate on the valve should close before the pssst sound is heard. The air that escapes is that which remains in the pump hose. However air is lost when the pump is connected as the air in the shock then fills the pump hose so if you are going to give a reading it needs to be after you have just added air.
    Last edited by spooney; 06-05-2010 at 04:56 AM.

  37. #37
    screamer
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    Quote Originally Posted by spooney
    When the pump is disconected from the shock there should be no air lost as the gate on the valve should close before the pssst sound is heard. The air that escapes is that which remains in the pump hose. However air is lost when the pump is connected as the air in the shock then fills the pump hose so if you are going to give a reading it needs to be after you have just added air.
    Ok, well thanks for rephrasing what I was saying above, but it's not what I was asking. If we're trying to compare pressures from person to person, it would help to know when people are taking their readings. Although in the cold hard light of day, I'm thinking that 5psi is well within the margin of error of such a comparison, so it's probably not worth worrying about.

    In practice, of course the only thing that matters is that you follow the same technique yourself, so that you can keep track of relative differences in your own system.

    Carry on.
    On heavy rotation: White Lung: Deep Fantasy

  38. #38
    mfm
    mfm is offline
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    130 lb
    120 psi
    Dh

    I'm on ride #15 on this bike and I'm still struggling a bit trying to figure it out. If I've never gone through all the available travel with this shock (Float RPL) do you guys think I should reduce the psi?

  39. #39
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    Quote Originally Posted by mfm
    130 lb
    120 psi
    Dh

    I'm on ride #15 on this bike and I'm still struggling a bit trying to figure it out. If I've never gone through all the available travel with this shock (Float RPL) do you guys think I should reduce the psi?
    I would think so. I use my entire range but don't think I've bottomed out per say (never do big jumps)

    205lb with gear
    135 psi Float RP23 (125psi for front on RS Revelation)
    XC/some AM

  40. #40
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    205 lbs with gear
    140 psi X-Fusion 02RL
    Trail-XC

  41. #41
    It's the axle
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    145lb with gear
    115 psi Float RP23
    XC

  42. #42
    aka dan51
    Reputation: d-bug's Avatar
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    Quote Originally Posted by budgie
    So for the purposes of consistency's sake in this database we're talking about the first case, right? Pressure that reads once the pump is first attached?
    I would guess no.
    I read my pressure when I'm done pumping air into it, and before I remove the pump.
    Doing the reading when putting the pump on I think would give incorrect results. A higher pressure can would likely release a few more PSI than a less pressurized can. The PSI drop will also vary based on the length of hose the shock pump has.

    205lb with gear
    135 psi Float RP23 (125psi for front on RS Revelation)
    XC/some AM
    How do you do that? I weigh the same and run 90PSI MORE than you and bottom all the time. I do tend to hit jumps, but nothing bigger than 3-4'. At 135PSI I think I'd bottom just going off a curb.
    I do run my Rev at a lower pressure than you.
    I must have all the weight in my butt, and you have it all in your forearms

  43. #43
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    Quote Originally Posted by budgie
    Hey, sorry to resurrect an old thread, especially with a dumb question, but here goes: I assume these shock pressures everyone is posting are the resting pressures once the pump is attached (as opposed to when air is added to the shock)? In my experience when adding air to a shock about 5psi is "lost" -- presumably from the hose, valve, etc. -- when the pump is detached and you hear that "pssht." Of course it's not lost from the shock itself, but rather from the pump and fittings. Over the years this has been the case on many different shocks, with many different pumps. So for the purposes of consistency's sake in this database we're talking about the first case, right? Pressure that reads once the pump is first attached?

    Just want to make sure I'm comparing apples to apples here... still trying to find my own sweet spot and this info is a helpful benchmark!
    As long as the pump and the shock are coupled together, the pressure you read is the same in both. The 5psi you are talking about is not really lost when the pump is disconnected, but when it's re-connected. So, no matter when you take the reading, it is what it is.

  44. #44
    MountainGoat aka OldGoat
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    155 w/gear
    140 psi RP23
    xc and light am
    Vote with your feet.
    No bike is perfect!

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