# Tire Pressure Calculator

A useful tire pressure calculator to define for your bike tire the suggested pressure. Either you have a road bike or a mountain bike, the application below will guide you in order to find the ideal pressure. We’ve used the “PSI RX” article by Jan Heine, Adventure Cyclist magazine.

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## Tire Pressure Calculator – by Full Weight

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If calculated pressure exceeds tire’s rated maximum, choose a wider tire. If calculated pressure is below tire’s safe minimum, choose a narrower tire.

The tire pressure is important for comfort and safety. It has two primary impacts: grip and rolling resistance. The more contact makes a tire with the road or another surface, the greater grip levels it achieves. An over-inflated tire rolls only on the central strip and has bad grip.

Rolling resistance depends on friction occurs between surface and tire; the greater the friction, the greater the resistance. An under-inflated tire provides too much contact with the surface and deforms more. Therefore it has too much rolling resistance.

To achieve the best rolling resistance and grip levels, it is vital to get the right tire pressure.

If you run a low pressure, tires with inner tubes are more subject to ‘pinch flat’ punctures; this occurs when a great impact on the tire causes the tire’s bead to pinch and puncture the inner tube. There are no ‘Pinch Flats’ on tubeless tires because they have no tube to pinch. So sometimes to reduce the risk of puncturing you need to use a slightly higher than the optimal pressure in an inner tube set-up. Tubeless tires (like the Schwalbe G-One) can be run at lower pressures.

Many riders advise dropping tire pressure in wet riding conditions. If you decide to lower tire pressure, then do so not more than 2 PSI. The significant reduction may cause the tire to squirm more, making it unstable.