About

This site runs a single tool -- a tire size calculator -- plus a set of reference guides about tire sizing, load index and speed rating. Everything the calculator does happens in your browser: the sizes you type are never sent to a server.

This site does not sell tires, does not represent any tire manufacturer, and does not tell you whether a tire "fits" or is "safe" for your vehicle. The calculator reports geometry -- diameter, circumference, revolutions per mile, speedometer error -- computed from the sizes you enter, nothing more. See the disclaimer for the full limits of what the calculator can and cannot tell you.

Any brand or tire-size name mentioned on this site is used only to describe or refer to that product (nominative fair use) -- this site is not affiliated with, sponsored by, or endorsed by any tire or vehicle manufacturer.

Who runs this site: Manduc S-V Emanuel Sorin PFA, a Sole trader (PFA) registered in Romania. See Contact and Privacy for how to reach the operator and how your data is handled.