Terms of use

Information, not a service

Tires and Wheels in Phoenix publishes educational pages about tire sizing, wheel concepts, desert driving conditions, and related maintenance ideas. The upsize calculator applies a standard geometric formula to the width, aspect ratio, and rim diameter you enter. It estimates overall diameter, sidewall height, revolutions per mile, and the speedometer difference that follows from a diameter change.

Those estimates can differ from a real tire. Manufacturers measure on specified rims, new tread is taller than worn tread, and flotation sizes are not what the form accepts. A result inside or outside the 3 percent mark is not clearance, not a load-index check, and not permission to drive on a size the vehicle was not designed for.

No professional relationship

Nothing on this site is mechanical advice for a specific vehicle, legal advice, or a safety inspection. Tire and wheel work can affect braking, speedometer accuracy, and whether a tire stays on a rim. Have a qualified person verify fitment, torque, pressure, and condition before you drive on a changed setup. The about page states that this site is not a shop.

No warranty

The pages are provided as written, without a warranty of completeness or fitness for a particular truck, tire, or trip. To the extent the law allows, the publisher is not liable for loss or damage that results from using the guides or the calculator, including a purchasing decision you make after reading them. You are responsible for confirming specifications against the vehicle placard and the parts in front of you.

Acceptable use

You may read and link to these pages. You may not present the text as a shop's official fitment sheet or strip it into a misleading advertisement. The privacy page describes the data practices of the site as published on October 20, 2026.