Pressure Poll based on newer standards- Mtbr.com
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  1. #1
    17j
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    Pressure Poll based on newer standards

    We all know about the various studies on tire pressure, rolling resistance etc etc...Where and what you ride is a variable as well as others but, in an effort to keep it simple and because things have changed...for a common xc set up these days There are so many variables including casing but just as a baseline for consideration:
    If you run a 29" wheel with a 24-26 IW wheel and 2.20-2.30 tires...set up tubeless
    Please share your body weight and what pressure you run your tires Thanks

  2. #2
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    I am 175# with 2.35 Ikons I run 19-20 psi front and 24-25 psi rear (on a HT in very rocky and rooty conditions). I go up 1-2 psi with 2.25 Mezcal or RoRo's

  3. #3
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    Quote Originally Posted by jbell View Post
    I am 175# with 2.35 Ikons I run 19-20 psi front and 24-25 psi rear (on a HT in very rocky and rooty conditions). I go up 1-2 psi with 2.25 Mezcal or RoRo's
    Same as him, except I need to run more than 30 to avoid pinches and if it's really rough terrain or I'm riding hard, more like 35. Can get by with a few psi lower in the front.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

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    Quote Originally Posted by Jayem View Post
    Same as him, except I need to run more than 30 to avoid pinches and if it's really rough terrain or I'm riding hard, more like 35. Can get by with a few psi lower in the front.
    Are you pinch flatting tubeless @ 30psi?

  5. #5
    LDC is ded,deth by trollz
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    Why is this in the endurance xc racing thread and not wheels and tires

  6. #6
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    I'm at 180, recently ran Nobby Nics (2.35F/2.25R) at 24-25 PSI on 24mm (internal) LB carbon rims at the Pisgah Stage Race...lots of very rocky and rooty singletrack and descents.

    I thought to run Racing Ralphs that week (as many were on Ralphs, Race Kings, Ikons, etc), but I was riding a hardtail and wouldn't describe my riding style as having finesse. That said, the NN's were looking a bit like RRs by the last stage of the race

  7. #7
    17j
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    Quote Originally Posted by LaneDetroitCity View Post
    Why is this in the endurance xc racing thread and not wheels and tires
    I figured people here were more likely to know what they run as racers looking for repeatable results vs wheels and tires may go by feel, that's all. Thank you

  8. #8
    17j
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    FWIW, I am 165 and run in mid to upper teens, as it seems to take the edges off of things and great grip. I'm in my 40's too so my joints and surgeries welcome the lower impact, but doing well in the 15-45 class so rolling isn't killing me.

  9. #9
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    Quote Originally Posted by jbell View Post
    Are you pinch flatting tubeless @ 30psi?
    In rough terrain, at 30, I will pinch the tire (or bang the rim). I did pinch a tubeless tire last season, didn't give out right away, but it did a few rides later. I don't run tubeless to run lower pressure or not pinch, if I did, I'd be hitting my rims on stuff all the time, and rims are expensive, carbon or aluminum. Back in the mid 90s we were running big tires and I couldn't run pressure any lower then. I run tubeless for the flat resistance (punctures) rolling resistance (much better) and lighter for the amount of flat protection. Some people are convinced with 2.3s they can go down into the teens, but when I do that, it's rim-cracking time.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

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    What I have learned racing is to not up the pressure or set the suspension firmer than what I usually run. I usually think "race, set stuff firmer for more efficiency and because I'll be harder on it", it always ends up pounding me way too much over the long distances.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

    You're turning black metallic.

  11. #11
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    I vary mine from race to race, terrain is different at every one, from rocks to sand. Anywhere from low 20's to mid 30's.

  12. #12
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    Quote Originally Posted by jbell View Post
    I am 175# with 2.35 Ikons I run 19-20 psi front and 24-25 psi rear (on a HT in very rocky and rooty conditions). I go up 1-2 psi with 2.25 Mezcal or RoRo's
    This, but I am 10# less, so subtract 1 psi.

    So... 165#, 2.35 Ardent Race @ 18 psi; 2.25 Ikon @ 23 psi. If lots of road work in event, add 1-2 psi.
    I just wanna ride...

  13. #13
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    200# XR3/XR2 combo on XXX 29mm internal wheels. 22-23F and 26-27R

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