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  1. #1
    Join Date
    Jun 2010
    Posts
    6,446

    Tire Pressure. Rider Weight. Tire Width.

    Not sure how accurate this is, but found this guide to tire pressures versus rider weight and tire width:

    Tire Width=20: Pressure(psi) = (0.33 * Rider Weight in lbs) + 63.33
    Tire Width=23: Pressure(psi) = (0.33 * Rider Weight in lbs) + 53.33
    Tire Width=25: Pressure(psi) = (0.33 * Rider Weight in lbs) + 43.33
    Tire Width=28: Pressure(psi) = (0.33 * Rider Weight in lbs) + 33.33
    Tire Width=32: Pressure(psi) = (0.17 * Rider Weight in lbs) + 41.67
    Tire Width=37: Pressure(psi) = (0.17 * Rider Weight in lbs) + 26.67
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  2. #2
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    Probably a reasonable starting point, which is all a chart like that can ever be. Tire pressure is part of the suspension, and just like setting up any other suspension component, final numbers are going to depend on terrain, riding style and personal preference.

    Kind of interesting though that I like very stiff fork springs in my moto, and I also like my bici tire pressure high ...
    Speed comes from what you put behind you. - Judi Ketteler

  3. #3
    Join Date
    Jun 2010
    Posts
    6,446
    I like my pressure a little high, too. This will really help me on my cross bike, though. I've been putting it somewhere in the middle of the numbers listed on the sidewall.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  4. #4
    Join Date
    Sep 2013
    Location
    Montreal, QC
    Posts
    773
    On my 23mm it should be around 120 but I find it too stiff/bumpy. So I asked husband to drop it and at 110 it is much better. If it was not riskier for flats, I'm sure I'd drop it to 100-105.

    On the 25mm (gatorskin) I keep it as 105. Just good.

  5. #5
    Join Date
    Sep 2009
    Location
    Tucson, AZ
    Posts
    2,045
    I just pump my tires up to 100 psi (Gator skins, 23 mm)....
    2016 Specialized Ruby Comp disc - Ruby Expert ti 155
    2010 Surly Long Haul Trucker - Jett 143

  6. #6
    Join Date
    Jun 2010
    Posts
    6,446
    Quote Originally Posted by azfiddle View Post
    I just pump my tires up to 100 psi (Gator skins, 23 mm)....
    Ha! My Cross bike has 35 mm tires on it. The chart doesn't include that listing, so I decided to use 33.67, which is between the values listed for 32 and 37. More or less. Did I mention I've been approximating the pressure? I've been setting it at 60-65 ish. The result of the above calculations means that I should have inflated the tires to...60.

    Sigh. so much for that.
    So long as the wheels are still turning, life is good.

    Battswebb

    Pinarello Quattro~CAADX~ Zurich Lemond
    Specialized Romin Saddles

    Surly Krampus!

  7. #7
    Join Date
    Sep 2009
    Location
    Tucson, AZ
    Posts
    2,045
    My Surly LHT has 26 x 1.5 inch tires that say 70 psi max. It's so new I've only pumped up the tires twice and I can't remember for sure, but I think I put them at 65. That would come out to something like 40??? That seems kind of low....
    2016 Specialized Ruby Comp disc - Ruby Expert ti 155
    2010 Surly Long Haul Trucker - Jett 143

 

 

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