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Thread: DH Tire PSI

  1. #1
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    New question here. DH Tire PSI

    Im trying to get an idea of how much people weight and what PSI they are using front and rear.

    My Current set up, it might be a little low..

    Front -Michelin DH 32 2.8 25 Psi
    Rear- Michelin DH 24 2.5 32 Psi

    Weight 220
    Captain's Rides
    2008 Turner 5.Spot Raw - Pushed RP23 / Pike 454 U-Turn
    2008 Turner Highline GDO - CCDB / Fox 40

  2. #2
    pin it to win it
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    Mostly its personal prefrence and how bad you don't wanna flat. I just check my pressure by feel and how the bike is handling and riding.

  3. #3
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    I wanted to put together a Rider weight to PSI chart. I think with enough data i can get a ratio between PSI and Weight.
    Captain's Rides
    2008 Turner 5.Spot Raw - Pushed RP23 / Pike 454 U-Turn
    2008 Turner Highline GDO - CCDB / Fox 40

  4. #4
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    there are a lot of variables that i think just one chart wont do the trick.

  5. #5
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    "I wanted to put together a Rider weight to PSI chart. I think with enough data i can get a ratio between PSI and Weight."

    I would imagine that there are far, far too many variables.

    edit. Typing at the same time as brilliantesdv - pardon the repeat advice.

    What use is a philosopher who doesn't hurt anybody's feelings? -
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  6. #6
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    yea i agree, its a great idea, but to many variables
    im 61kg
    front tire : 40-55 PSI
    rear tire : 40-55 PSI

  7. #7
    = dirt torpedo =
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    205 lbs.

    front Minion DHF 2.5 - 28-29psi
    rear High Roller 2.5 - 28-29psi

    somewhere between 28 and 29 seems to be the magic number for me, perfect balance between traction/drift and avoiding pinch flats and dinged up rims.
    I check pressure with a digi gauge before every ride, so I know what to expect.

    On my other bikes, however, I run different pressures.

    Dirtjumper
    Holy Rollers 2.4 front and rear - 32psi

    Trail bike (hardtail)
    Kenda Nevegal 2.5 front - 34psi
    Maxxis Advantage 2.4 rear - 35psi

    all these were arrived at after much experimenting and finding what works for me. Often times I ride with guys that are similar size, and their pressure settings are all over the map. I think a lot of this has to do with riding style and personal preference, that's why creating a blanket weight/psi chart may be a bit difficult.

  8. #8
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    Quote Originally Posted by Nick_M2R
    yea i agree, its a great idea, but to many variables
    im 61kg
    front tire : 40-55 PSI
    rear tire : 40-55 PSI
    holy cow. your tires are about to pop. are you riding on single plys or something? you shouldnt have to run over 40psi on DH tires. even on rocky, pinch flat prone terrain.

  9. #9
    SamIAm
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    you can tottally run DH tubes at that psi. just whether you want to or not.

    i used to run like 19-22 in my 2.7timberwolves. but that tire weighs like 1800g by itself. could prolly run it flat and itd still roll. lol

    otherwise i run 30-35 psi in 2.5 minions
    <(*-*<) Go Ride (>*-*)>

  10. #10
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    225 lbs, 32-35 PSI front and rear (Nevegal 2.5, Michy 2.8 and 2.5, Maxxis 2.7 and 2.5). My 135 lbs girlfriend tried 32-35 PSI last summer and was instantly faster (she can beat most guys down A-Line).

  11. #11
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    180 lbs
    front: nokian gazz jr. 2.6: floating somewhere between 15 and 19psi depending on how loose the terrain. tubed
    rear: maxxis minion DHR 2.5: 30-32psi, tubeless. any less and it starts washing/burping.

    as was said though, there's too many variables to take into account: rider weight, style, riding area, type/brand of tire, build of tire (that front tire I'm using is 4 ply), volume of tire, width of rim, tubeless or tubes, tread pattern, etc etc etc....

  12. #12
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    140 lbs
    front: 2.5 kenda nevs, continental 2.5 tubes: 30~32 psi
    rear: 2.5 kenda nevs, kenda 2.7 DH tubes: 30~32 psi

    OT: if i were to go tubeless, what is the minimum tyre pressure?

  13. #13
    Living the High Life
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    Quote Originally Posted by Captain Snakebite
    I wanted to put together a Rider weight to PSI chart. I think with enough data i can get a ratio between PSI and Weight.
    And you're going to get your data from and internet forum

    *EDIT- run it as low as possible until you hear your rim hit a rock.
    Last edited by Ithnu; 02-17-2009 at 10:01 PM.
    You have just been mentally Rick Roll'd. Yup you're thinking about it right now aren't you? Don't fight it.

  14. #14
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    165 lbs
    2.5" 2-ply Nevegals with XC tubes: Front 22-24 psi, Rear 24-26 psi (DH use)
    2.5" single ply Prowler MXs with XC tubes: Front 28-30 psi, Rear 30-32 psi (non lift assist)

  15. #15
    AKA shitbird
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    185 pounds

    Front: about 27 psi - Maxxis Ardent 2.5 DH casing running tubeless on a UST rim (mavic 823)

    Rear: 30 psi - Maxxis High Roller 2.5 DH casing running tubeless on a UST rim (mavic 823)
    JRA

  16. #16
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    121lbs
    2.5 2ply maxxis dh minion F Front 22-25psi
    2.35 1ply maxxis high roller rear 40-50psi

    Single ply sucks, gonna swap that out really soon...

  17. #17
    I CAN ALWAYS GO BIGGER
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    Minion DHR/DHF 30psi,Chunder SX 2ply folding bead 30psi in any condition. Wet or dry

  18. #18
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    Quote Originally Posted by kwan
    OT: if i were to go tubeless, what is the minimum tyre pressure?
    there was a thread somewhere about this. do a search. but the answer is the same really. it all depends on the tire, rider, riding condition...etc

    you can go pretty low, but there's a point where its too low. you'll start folding over sidewalls and stuff

  19. #19
    squish is good
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    Not to mention tire volume will affect how the PSI reflects the tires actual spring rate or stiffness.

    I run 2.7 DHf's or these weird 2.5 Marzocchi bomber tires (made by Nokian, they came with my DH bike when I bought it but stick like effing velcro!).

    30 psi front and rear and it feels pretty stiff on both. I prefer a higher tire rate on the DH bike so the thing doesn't float around as much in the corners. Felt like the tire was going to roll off at lower pressures.

    Edit - my riding weight is around 180ish, depends on my gear and season (I'm a lazy bastard in the winter and tend to put on a few extra pounds )
    Last edited by Clutchman83; 02-18-2009 at 10:58 AM.
    Bike good, work bad.

  20. #20
    Natl. Champ DH Poser/Hack
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    i cant remember what ive run for psi or any other damn thing so i built a setup sheet with exel. now i can go back, see what did or did not work on the bike at a particular venue and be better prepared before i ever get to a course. well, at least have a baseline.
    No, I'm NOT back!

  21. #21
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    Quote Originally Posted by brillantesdv
    holy cow. your tires are about to pop. are you riding on single plys or something? you shouldnt have to run over 40psi on DH tires. even on rocky, pinch flat prone terrain.
    Yeah haha i know im a freak. For DH i run my Minion DHF/R at 40 PSI, ive run them lower and i honestly dont like the mushy feeling that comes with the lower pressure, i feel like im gonna walk the tire ofr the rim. Still, wih 40 psi on the DH runs feels like im skipping over the rocks anyway, haha like a out of control freight train!

  22. #22
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    180lbs.
    Front: 30 ish
    Rear: 35 ish

    I do currently run single ply Big Earl tires though. Pressure would very likely be lower with beefier tire.

    Tons and Tons of Variables. I'd be very suprized if you could churn out a chart that has any sort of referenceable data.

  23. #23
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    135 lbs.
    2.5 hi roller slow reazzay 2ply front and rear 18 psi front, 20 psi rear.

  24. #24
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    Quote Originally Posted by slothoncanvas
    Tons and Tons of Variables. I'd be very suprized if you could churn out a chart that has any sort of referenceable data.
    I sit in front of a computer all day and pump out excel files. So this will be a nice change of pace. Need somthing to take my mind off FP&A and Product Launch.
    Captain's Rides
    2008 Turner 5.Spot Raw - Pushed RP23 / Pike 454 U-Turn
    2008 Turner Highline GDO - CCDB / Fox 40

  25. #25
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    "I sit in front of a computer all day and pump out excel files. So this will be a nice change of pace."

    With the utmost respect, Captain, I think you'd be wasting your time. As a few of us have already said, there are too many variables to but together a list/chart which is simple enough to be used a point of reference. Even if you could somehow factor for the precise terrain (loose/rough/slippy/soft/wet/dry...); the variations in exact tyre width (a 2.35 High Roller is not as wide as a 2.30 Specialized Chunder, for example); rim width; different rubber types/compounds; tread pattern; suspension travel etc., etc., at some point you're going to arrive at the greatest and most problematic of these variables: personal preference.

    If you want a change of pace, go and read War & Peace.
    Last edited by SteveUK; 02-18-2009 at 02:54 PM.

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  26. #26
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    37FR 39RR Big Earl 2.5 wets. I prefer them not to roll off the bloody rim in the corners and i like to be able to pedal the damn thing on the hills.

  27. #27
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    i weigh 225lbs and I run a minion [email protected] psi front and high [email protected] both ghetto tubeless.

  28. #28
    ..ouch
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    Dual ply DH tires (tubeless or ghetto tubeless) = 28 front / 30 rear

    Trail/Freeride (usually tubed 2.4 Big Bettys) = 30-32 front / 32-34 rear

    I'm 250+ with gear and get plenty of rocks here in CO.

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