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  1. #451
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    I weigh 235lb's in my birthday suit...

    I also advocate for the tyre determines the required pressure.

    2.4's I've run in the past @ 22-24psi... 2.35's = 23-25psi... 2.3's = 24-27psi... 2.2's = 28-30psi...

    Plus I run tubes... I get a flat once a year, on average. I run protection variety tyres only. Little extra weight for peace of mind.

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    Last edited by targnik; 08-19-2016 at 04:29 PM.
    to err is human... to face plant is frickin hilarious!!

  2. #452
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    Quote Originally Posted by Osco View Post
    Current setup,
    Scott Spark 760

    185 pounds in full ride gear.

    27.5 X 2.25 Rocket Ron out back, tubed 25 psi feels great, no pinches.
    a 500ish gram tire.

    27.5 X 2.35 Bonty XR-3 front, tubed at 23 psi,,, feels great, no snake bites yet
    a 700ish gram tire.

    Lower than this gives me a squirmy ride, lowest tested so far 23 rear, 21 front, tubed.
    I'm the same weight as you and settled in at the same pressure on tubeless HD trailstar front and same tire but in Supergravity on the back. Pleased with grip and ride quality over the rough stuff.

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  3. #453
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    Quote Originally Posted by Gregon2wheels View Post
    In praise of higher tire pressure - I ran 40 psi (highest safe pressure on Stan's rims per Stan's) just because I was too lazy to tune the pressure after doing a road ride with my son.

    With the trails dried out -- WOW! Yes, I gave up some traction, and, no, these are not technical trails besides some roots. What I gave up in straight line traction I made up for in fast turning on the tight corners built into these trails. So much fun and so responsive.

    It's not a setting I'd use all the time, but on trails I know with hard conditions, it was fun!
    I run pretty much max pressure of whatever tire im on. Currently Ikon 26 x 2.35 @ 60psi and in my experience the skitish behavior of high psi can be overcome by smooth body control and good sense. I do give up some bite on climbs and on some of the hairy corners I take them a bit slower but everywhere else, i'm flying way faster with the increased pressures and not having to pedal so much to maintain speed either. I put down a fair bit of mileage each year and the added bonus of almost never flatting out from tubes and high psi is a double bonus on a 100mile tour. I fly over roots and rocks and hang on tight, set the suspension on the soft side with lots of rebound control to do the job it was made for instead of relying on the tires as springs.

    Different strokes for different folks.

  4. #454
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    Wow.
    I'd consider 24psi as far to high for a front 26x2.35 Ikon.

  5. #455
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    LOL! That's a bit like the guy over in the Specialized forum that said his 29x2.3 Fastrak (which actually measure out to a shy 2.2 btw) felt 'supple' at 2 bar (29psi) and his 71kg (156lbs)...

    supple he said...

    Anyway, not to discredit urban commando...what happened to the data that said that lower pressures actually attributed to faster times because the tire wasn't being deflected as much?

  6. #456
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    I figured that post would pop some eyes open and invite the hecklers. Theres nothing supple about my set up thats for sure. Its skittish, but its fast and durable. Also worth noting on loose gravel the high psi is BRUTAL for wash outs around corners, thats probably where they are at their worst. On dirt or even mildly wet loose dirt its a handful but manageable and fun too. I also really like the nevagels @ 50psi on loose terrain they corner excellent, climb and roll quite well but only when its loose. Those tires are slugs on hard surfaces imo. Also in the 2.35 btw.

  7. #457
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    I'm not meaning to heckle you urban commando. Your post just reminded me of that other one. Actually the way you commented about it, relayed effectively that you were dialing the suspension to help compensate and that it was still a compromise.

  8. #458
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    i run 35 rear 30 front with 2.3 geax sturdy's on my hardtail

  9. #459
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    Quote Originally Posted by omarlin29 View Post
    i run 35 rear 30 front with 2.3 geax sturdy's on my hardtail
    How much do you weigh? 250?

  10. #460
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    Quote Originally Posted by NordieBoy View Post
    26x2.3 X-Kings on 18mm id rims (rigid single speed).
    20r/16f is good for the bumps, but as I found today, it's easier to (almost) roll a tyre at 16psi.
    21r/18f may be safer...
    I want to run 16f/20r but am worried about rolling the tire right off the rim. I run 20 and 23 right now without squirm at slower speeds but am riding faster trails starting in the spring.
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  11. #461
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    Interesting that he is running very close pressure to me. Much faster though which increases my confidence that I won't lose a tire. https://youtu.be/RnoA05c-_os
    2015 Giant Trance 3
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  12. #462
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    Hi, with 220lb ( bicycle + me) and 2.35 tire, i run 21.2f/23.4r for xc, and 24.9f/27.5r for smooth rolling on good roads.
    I use this android app that calculates pressure with 15% or 18% drop. https://goo.gl/0laa5O

  13. #463
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    Quote Originally Posted by tramuntana View Post
    Hi, with 220lb ( bicycle + me) and 2.35 tire, i run 21.2f/23.4r for xc, and 24.9f/27.5r for smooth rolling on good roads.
    I use this android app that calculates pressure with 15% or 18% drop. https://goo.gl/0laa5O
    23.4? That's crazy! No less than 23.6 for me.
    I brake for stinkbugs

  14. #464
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    I haven't read all of the posts in this thread so I apologize if this has already been discussed...

    I've found that comparing tire pressures are problematic, given that tire pressure gauges give such a wide range of pressures. Your gauge may say 24psi and mine could read more or less.

    I had two gauges of the same brand that I purchased at the same time and one read 3-4psi more than the other. Which one was correct? Where either of them correct?
    Never be afraid to try something new.

    Remember amateurs built the Ark.
    Professionals built the Titanic.

  15. #465
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    most likely neither was correct. You should just use one of them, figure out what pressure works best for the trail on that day and in those conditions, and you will constantly have to adjust for each ride (especially as ambient temperature changes so much). It may seem stupid or not precise enough to grab your tire and squeeze, but because gauges vary so much you should try to memorize how your tire feels at your ideal pressure, so then you can use that as a rule of thumb when using other pumps.

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