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Tire Pressure Calculator

Edit: 10/26/15 – I’ve removed the link to the google Doc. The locked fields didn’t work, and people have defaced it pretty severely.  Download this XLS file for your own use: Tire Pressure – salvaged doc

You can use the tire pressure Excel file to calculate pressures for different kinds of bikes. Put in your weight and tire width, and it gives you the optimal pressure for Road, Cross, Mountain Bikes, Low-trail randonneur bikes, Fat Bikes and Triathlon bikes.

Download the Bicycle Tire Pressure Calculator spreadsheet

You can fudge the numbers based on your experience, tire casing, riding style, and road surface.  More info about the pressure calculator.

There is also an Android app available. You can save your bikes and easily access them later. You can even do custom calculations for cargo bikes, which the doc doesn’t do yet.

From Dave Adams, bsed on research by Frank Berto, as published in Bicycle Quarterly.

 

15 thoughts on “Tire Pressure Calculator”

  1. What this doesn’t tell you is how to determine the actual pressure only the theoretical pressure.

    Example:
    My bike and I weight 210 lbs together – the app says my 23c tiers should be 130Rear/84 Front
    My tires maximum PSI rating is 90 psi
    Does this mean I need to find a tire that can handle 130 psi to use for my front tire?

  2. Thanks for the spreadsheet!

    Question… A 23c tire could very well measure 22 on a narrow internal width rim or 24 on a wide internal width rim. Does this change actually affect the proper inflation pressure for a particular tire? Its seems like its still the same amount of rubber and therefore the same volume, just distributed “taller” on the narrow rim and “wider” on the wide rim. Therefore one would use the same pressures for both rims. But that doesn’t seem correct somehow. Thanks.

    1. I think you could get a little more volume on a tire with a wide rim. I’d use the measured width, not the supposed width, but either will get you in the ball park.

  3. All I saw was the inputs to 4 unknown bike styles and Low Trail. Will this spreadsheet ever show all the bikes you mentioned at the beginning of your blog?

    1. Hi Steve,
      No, probably not. Google Sheets couldn’t keep the protected cells protected, and the human visitors just made a giant mess of everything.
      If you want to do Triathlon bikes, just use “Low Trail” and switch front and rear tire values.

      Philip

  4. Thank you for the xls, I’ve been looking for something like this.

    Are you the app’s author/will you see revenue if I buy?

    Many thanks, again.

    1. Turtles, Man…
      Excellent – enjoy the XLS!
      I worked on the app, but my royalties have expired. If you have an Android phone, you should try it out.

      Philip

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