This JavaScript form is used to calculate the tire widths for a four-wheeled vehicle that produce identical or nearly identical contact pressures on both the front and rear tires, based on front and rear axle weights. To put it simply, this calculator generates a list of tire pairs with a width distribution that matches the front-to-rear weight distribution of the vehicle. Note that if the weight is distributed unevenly from side to side, contact pressure will vary accordingly.
Follow all vehicle manufacturer's instructions carefully when selecting tire sizes. Using the wrong tire sizes can cause problems with safety, handling, speedometer accuracy, and powertrain management systems. Use this calculator at your own risk!