![]() ![]() This is because tyre pressure can be measured in different units: BAR pressure or PSI (pounds per square inch) being the most commonplace. If you’re wondering what tyre pressure is measured in, units-wise, that’s where our converter tool can help.Many modern cars also have a sensor installed called a TPMS which alerts the driver to the decreasing or low tyre pressure. Use a tyre pressure gauge to check the pressure, and carefully follow the instrument’s instructions.This information can be found by a number of means, including the vehicle manual, inside your fuel cap, on the inner door frame or simply by contacting your vehicle manufacturer. The ideal tyre pressure is determined on a case-by-case basis, and will depend entirely on the make and model of your vehicle, alloys used, load carried, and typical passenger usage – front and rear tyres may also perform better at slightly different pressures to each other.It’s thought that warmer weather can decrease tyre pressure more rapidly, so make sure to check more regularly during the summer months.To get an accurate reading, check it only when your tyres are cold e.g.Tyre pressure should be checked once a month. ![]() It’s therefore paramount that you’re keeping tyre pressure in line with the recommended figures for your specific vehicle. The benefits of maintaining the correct tyre pressure include: Both under-inflated and over-inflated tyres can affect how much of the tyre is in contact with the road – this, in turn, will influence safety, performance, longevity and fuel efficiency. Likewise, motorists should also keep assess when inflating tyres of whether their tyres are over-inflated, too. While this is normal, car owners should keep on top of this by regularly checking their tyre pressure. Why is tyre pressure important?Įveryday vehicle use will naturally reduce tyre pressure over time. He is obsessed with keeping up to date with all the latest tech, is fixated with the smallest details and is known for his unique opinions.Simply put, tyre pressure is a measure of how much air is in your tyre, and this is measured in either BAR pressure or pounds per square inch (PSI) – you can convert between them using our online tool. Oscar prefers lightweight road and gravel frames with simple tube shapes, rather than the latest trend for aerodynamics and full integration. He is particularly fond of workshop tool exotica and is a proponent of Campagnolo groupsets. Oscar has a BA degree in English Literature and Film Studies and has close to a decade of cycling industry experience, initially working in a variety of roles at Evans Cycles before joining Carbon Bike Repair. His favourite rides are epic road or gravel routes, and he has also caught the bikepacking bug hard after completing the King Alfred’s Way and West Kernow Way. He’s since been indoctrinated into gravel riding and more recently has taken to the dark art of mountain biking. He has been an avid cyclist since his teenage years, initially catching the road cycling bug and riding for a local club. Oscar Huckle is a technical writer at BikeRadar. Presta valves will close automatically, but the sprung Schrader valves are usually held open by a pin in the pump valve attachment (this means you don’t need any extra effort when pumping to overcome the pressure exerted by the spring). If it wasn’t there, the pump would just shoot open again. To prevent the pressure in the tyre leaking back out, the second check valve at the base of the pump closes. You extend the pump again, the check valve opens to refill the chamber with air and you repeat the process. That pressure increases until it exceeds that inside the tyre.Īt this point, a second one-way valve will allow air to flow from the pressurised pump chamber into the tyre. On a pump’s downstroke, a check valve (that allows air flow in one direction) seals the piston chamber, resulting in air being pressurised as the pump is compressed. This ‘overpressure’ forces air into the tyre, increasing its pressure too.Ī pump is just a manually actuated piston. The operating principle is simple you increase the pressure inside the pump until it exceeds that inside the tyre. Nick Clark / Our MediaĪ pump gets the air into your tyre. Some pumps feature rubberised handles for improved grip. ![]()
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