18-inch tire sizes
10 sizes fit a 18-inch rim, from 30.52 to 34.83 inches tall.
265/60R1830.52″ × 10.43″265/65R1831.56″ × 10.43″275/65R1832.07″ × 10.83″285/65R1832.59″ × 11.22″265/70R1832.61″ × 10.43″275/70R1833.16″ × 10.83″285/70R1833.71″ × 11.22″295/70R1834.26″ × 11.61″325/65R1834.63″ × 12.80″285/75R1834.83″ × 11.22″
All 18-inch sizes compared
| Size | Diameter | Width | Sidewall | Revs/mile |
|---|---|---|---|---|
| 265/60R18 | 30.52 in | 10.43 in | 6.26 in | 661 |
| 265/65R18 | 31.56 in | 10.43 in | 6.78 in | 639 |
| 275/65R18 | 32.07 in | 10.83 in | 7.04 in | 629 |
| 285/65R18 | 32.59 in | 11.22 in | 7.29 in | 619 |
| 265/70R18 | 32.61 in | 10.43 in | 7.30 in | 619 |
| 275/70R18 | 33.16 in | 10.83 in | 7.58 in | 608 |
| 285/70R18 | 33.71 in | 11.22 in | 7.85 in | 598 |
| 295/70R18 | 34.26 in | 11.61 in | 8.13 in | 589 |
| 325/65R18 | 34.63 in | 12.80 in | 8.32 in | 582 |
| 285/75R18 | 34.83 in | 11.22 in | 8.42 in | 579 |
Nominal dimensions from the official sizing formula (sources below).
Printed from https://tiresizecalc.net/rim/18-inch/. Figures as published on 2026-11-01. The sources are listed below.
Sources
- 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 2.15 and 6.1.2.1: aspect ratio and outer diameter, D = d + 2H. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Para 6.1.2.1: the same formula for light truck tires. Retrieved 2026-11-01.
- 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: allowed outer diameter, Dmin = d + 2H x 0.97, Dmax = d + 2H x 1.04. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. Circumference = pi x diameter; revolutions per mile = 63,360 / circumference; 1 in = 25.4 mm exactly. 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.