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Bicycle Tire Pressure Calc

Bicycle Tire Pressure Calc

100 - 500 downloads

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The Bicycle Tire Pressure Calculator is used to compute the optimal air pressure for your bicycle tires. Tires pumped too hard bounce down the road like a basketball, wasting energy. Tires pumped not hard enough are sluggish and prone to pinch flats. Tires pumped just right are at the optimal intersection of responsiveness, shock absorption, and energy efficiency.

Popular misconception is to pump a bike's tires to the highest number printed on the sidewall by the manufacturer. Instead, the optimal pressure is that which yields in a 15% sidewall drop. Sidewall drop is a non-linear function of the load on the tire and its width. It can be computed based on the weight of the bike, rider, bags, and gear. It is also different between front and back, depending on the frame geometry.

With this App, you can instantly compute the optimal tire pressure from your phone or tablet wherever you may be: in your garage, on the road, at a friend's house.

* Enter weights in either pounds or kilograms
* Calculate pressures in either PSI or bar
* Tire widths from 19 to 60 mm; diameters of 26", 650B, and 700C; 4 of the most typical frame geometries or user-defined measurements
* Configure and save multiple bikes
* Tap bike graphic to recalculate pressures

Tags: bicycle tire pressure calculator, gstar bike tyre pressure, road bicycle tire optimum pressure, cycling tire pressure calculator, bike tire pressure widget, road bike tire-pressure calculator, bicycle tyre pressure calculator, bicycle tyre pressure maths, mtb tire pressure calculator, bike tire presseure based on weight.

Recently changed in this version

v1.3 -
* New UI look and feel
* Misc usability bugs fixed

v1.2 -
* Fix v1.1 'hang' when reading saved bike config's from v1.0.

v1.1 -
* Internal mod to UI API's for improved compatibility with Android 4.0+
* Modify layout for optimization on very large and very small screens.
* Newly created bike configurations have front & rear loads set to zero.
* 'Custom' geometry type hides the rider weight field. (Bicycle's weight, while not hidden, is also ignored with the 'Custom' geometry.)

Comments and ratings for Bicycle Tire Pressure Calc
  • (69 stars)

    by Sean Campbell on 13/06/2014

    Works great, no guess work, where is the mtb selection?

  • (69 stars)

    by Amy Wressell on 08/05/2014

    It would be nice to see mountain bike geometries too.

  • (69 stars)

    by Chris Daigle on 09/10/2013

    I like this app. It makes a quick job of suggesting the correct tire pressure for your bicycle. Make your tires last longer and your bike ride nicer. Since most people run too much air in their tires, this should be on your phone.

  • (69 stars)

    by Logan Cummings on 01/08/2013

    Used this all the time on my droid3, fails to update on my droid DNA (HTC butterfly). Did have to tweak the weight distribution a bit for some touring bikes, but a noticeable difference in ride quality was seen.

  • (69 stars)

    by James Wilson on 31/05/2013

    Great App! 2 things I wish it had: The specific geometry listed for each bike type and a way to enter custom geometry. Other than that this is quite awesome!

  • (69 stars)

    by Robert Perks on 09/04/2013

    Tire pressures are a tricky thing, but great things can happen when you get the perfect level of cush and speed. This app will help you get a good baseline or starting point to make fine adjustments from. There are going to be some things it can not model like variations in tire construction or accuracy of weight and loading, but it will get you in the ballpark for sure. After that, the fine tu