Tire Pressure Calculator

When replacing original equipment tires with a new tire size, typically there is a change in tire load rating, which may require adjustment of tire inflation to comply with the original tire's load capacity. To get proper inflation of the replacement tire, you have to reference tire load and inflation charts and find corresponding tire load capacity and inflation that matches or exceeds the original tire's load capacity.

Keep in mind that the maximum pressure listed on the tire sidewall is not necessarily a recommended tire pressure for your vehicle.

Learn more about how to apply tire load inflation tables when replacing tires.

Our tire pressure calculator can help you determine if a new tire size can adequately support the load of the original tire, and what pressure should be used on replacement tires.

WARNING: Use of this tire pressure calculator is for reference only. TirePressure.com does not warrant or make any representations regarding the accuracy of or the results of the use of this calculator. Always consult a professional tire installer for accurate tire size and tire inflation settings.

Switching from Original Equipment Manufacturer (OEM) tire size to a new tire size is a common modification that can enhance vehicle performance, aesthetics, or off-road capabilities. However, ensuring correct tire pressure in this transition is paramount for several reasons. Firstly, tire pressure directly affects safety; incorrect pressure can compromise vehicle handling, braking efficiency, and overall stability, increasing the risk of accidents. Each tire has a specific load-carrying capacity, which can change with different sizes. Adjusting the tire pressure ensures that the new tires can support the vehicle's weight adequately, preventing excessive wear or potential blowouts. Moreover, tire pressure influences the contact patch, the area of the tire that touches the road. Incorrect pressure can alter this patch, affecting traction and handling. Under-inflated tires have a larger contact patch, which increases rolling resistance and heat buildup, while over-inflated tires have a smaller contact patch, reducing grip and increasing the risk of hydroplaning. Proper tire pressure also promotes even tire wear. Under-inflation causes excessive wear on the outer edges, while over-inflation wears out the center tread more quickly, both of which shorten the tire's lifespan. Fuel efficiency is another crucial aspect, as under-inflated tires increase rolling resistance, causing the engine to work harder and consume more fuel. Conversely, over-inflated tires might reduce rolling resistance but at the cost of safety and comfort.

All listed guides, data and/or calculations are for informational purposes only. TirePressure.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information.