Terms of use

Last updated 2026-11-01.

TireSizeCalc gives nominal tire dimensions for information only. Real tires vary by brand and load range, and nothing on this site confirms that a tire fits or is safe for a particular vehicle, load or speed. Check the vehicle placard, the tire maker's specifications and a qualified installer before you buy or fit tires.

The calculations, text and design of this site are © Sri Murugan Systems. Chart values are from the official documents named on each page.

Contact: contactus@tiresizecalc.net.

Printed from https://tiresizecalc.net/terms/. Figures as published on 2026-11-01. The sources are listed below.

Sources

1. UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 6.1.5: a real tire can differ from the nominal diameter. Retrieved 2026-11-01.
2. 49 CFR 571.110 - Standard No. 110; Tire selection and rims for motor vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less. National Highway Traffic Safety Administration (NHTSA), Code of Federal Regulations, annual edition (GovInfo). 2006-10-01. S4.3: the vehicle placard shows the original tire size and pressure. Retrieved 2026-11-01.

Last reviewed 2026-11-01. The full source list, with dates and file checksums, is in How the numbers are calculated. To report an error, email contactus@tiresizecalc.net.