18-inch tire sizes
135 sizes made for 18" wheels, from 23.6" to 41.0" tall. Click a size for inches, equivalents and comparisons.
| Size | Diameter | Width | Sidewall | Revs/mile |
|---|---|---|---|---|
| 145/70R18 | 25.99" | 5.7" | 4.00" | 776 |
| 145/80R18 | 27.13" | 5.7" | 4.57" | 743 |
| 145/85R18 | 27.70" | 5.7" | 4.85" | 728 |
| 26x6.00R18 | 26.00" | 6.0" | 4.00" | 776 |
| 155/60R18 | 25.32" | 6.1" | 3.66" | 796 |
| 155/70R18 | 26.54" | 6.1" | 4.27" | 760 |
| 155/85R18 | 28.37" | 6.1" | 5.19" | 711 |
| 155/90R18 | 28.98" | 6.1" | 5.49" | 696 |
| 165/70R18 | 27.09" | 6.5" | 4.55" | 744 |
| 165/90R18 | 29.69" | 6.5" | 5.85" | 679 |
| 175/90R18 | 30.40" | 6.9" | 6.20" | 663 |
| 195/60R18 | 27.21" | 7.7" | 4.61" | 741 |
| 26x8.00R18 | 26.00" | 8.0" | 4.00" | 776 |
| 205/35R18 | 23.65" | 8.1" | 2.82" | 853 |
| 205/40R18 | 24.46" | 8.1" | 3.23" | 825 |
| 205/45R18 | 25.26" | 8.1" | 3.63" | 798 |
| 205/60R18 | 27.69" | 8.1" | 4.84" | 728 |
| 215/35R18 | 23.93" | 8.5" | 2.96" | 843 |
| 215/40R18 | 24.77" | 8.5" | 3.39" | 814 |
| 215/45R18 | 25.62" | 8.5" | 3.81" | 787 |
| 215/50R18 | 26.46" | 8.5" | 4.23" | 762 |
| 215/55R18 | 27.31" | 8.5" | 4.66" | 738 |
| 215/60R18 | 28.16" | 8.5" | 5.08" | 716 |
| 225/35R18 | 24.20" | 8.9" | 3.10" | 833 |
| 225/40R18 | 25.09" | 8.9" | 3.54" | 804 |
| 225/45R18 | 25.97" | 8.9" | 3.99" | 777 |
| 225/50R18 | 26.86" | 8.9" | 4.43" | 751 |
| 225/55R18 | 27.74" | 8.9" | 4.87" | 727 |
| 225/60R18 | 28.63" | 8.9" | 5.31" | 704 |
| 225/65R18 | 29.52" | 8.9" | 5.76" | 683 |
| 235/30R18 | 23.55" | 9.3" | 2.78" | 856 |
| 235/35R18 | 24.48" | 9.3" | 3.24" | 824 |
| 235/40R18 | 25.40" | 9.3" | 3.70" | 794 |
| 235/45R18 | 26.33" | 9.3" | 4.16" | 766 |
| 235/50R18 | 27.25" | 9.3" | 4.63" | 740 |
| 235/55R18 | 28.18" | 9.3" | 5.09" | 716 |
| 235/60R18 | 29.10" | 9.3" | 5.55" | 693 |
| 235/65R18 | 30.03" | 9.3" | 6.01" | 672 |
| 235/70R18 | 30.95" | 9.3" | 6.48" | 652 |
| 235/80R18 | 32.80" | 9.3" | 7.40" | 615 |
| 245/35R18 | 24.75" | 9.6" | 3.38" | 815 |
| 245/40R18 | 25.72" | 9.6" | 3.86" | 784 |
| 245/45R18 | 26.68" | 9.6" | 4.34" | 756 |
| 245/50R18 | 27.65" | 9.6" | 4.82" | 730 |
| 245/55R18 | 28.61" | 9.6" | 5.31" | 705 |
| 245/60R18 | 29.57" | 9.6" | 5.79" | 682 |
| 245/65R18 | 30.54" | 9.6" | 6.27" | 660 |
| 245/70R18 | 31.50" | 9.6" | 6.75" | 640 |
| 245/75R18 | 32.47" | 9.6" | 7.23" | 621 |
| 28x10.00R18 | 28.00" | 10.0" | 5.00" | 720 |
| 255/35R18 | 25.03" | 10.0" | 3.51" | 806 |
| 255/40R18 | 26.03" | 10.0" | 4.02" | 775 |
| 255/45R18 | 27.04" | 10.0" | 4.52" | 746 |
| 255/50R18 | 28.04" | 10.0" | 5.02" | 719 |
| 255/55R18 | 29.04" | 10.0" | 5.52" | 694 |
| 255/60R18 | 30.05" | 10.0" | 6.02" | 671 |
| 255/65R18 | 31.05" | 10.0" | 6.53" | 650 |
| 255/70R18 | 32.06" | 10.0" | 7.03" | 629 |
| 265/35R18 | 25.30" | 10.4" | 3.65" | 797 |
| 265/40R18 | 26.35" | 10.4" | 4.17" | 765 |
| 265/45R18 | 27.39" | 10.4" | 4.69" | 736 |
| 265/50R18 | 28.43" | 10.4" | 5.22" | 709 |
| 265/55R18 | 29.48" | 10.4" | 5.74" | 684 |
| 265/60R18 | 30.52" | 10.4" | 6.26" | 661 |
| 265/65R18 | 31.56" | 10.4" | 6.78" | 639 |
| 265/70R18 | 32.61" | 10.4" | 7.30" | 619 |
| 33x10.50R18 | 33.00" | 10.5" | 7.50" | 611 |
| 275/35R18 | 25.58" | 10.8" | 3.79" | 788 |
| 275/40R18 | 26.66" | 10.8" | 4.33" | 756 |
| 275/45R18 | 27.74" | 10.8" | 4.87" | 727 |
| 275/55R18 | 29.91" | 10.8" | 5.95" | 674 |
| 275/60R18 | 30.99" | 10.8" | 6.50" | 651 |
| 275/65R18 | 32.07" | 10.8" | 7.04" | 629 |
| 275/70R18 | 33.16" | 10.8" | 7.58" | 608 |
| 285/30R18 | 24.73" | 11.2" | 3.37" | 815 |
| 285/35R18 | 25.85" | 11.2" | 3.93" | 780 |
| 285/40R18 | 26.98" | 11.2" | 4.49" | 748 |
| 285/45R18 | 28.10" | 11.2" | 5.05" | 718 |
| 285/50R18 | 29.22" | 11.2" | 5.61" | 690 |
| 285/55R18 | 30.34" | 11.2" | 6.17" | 665 |
| 285/60R18 | 31.46" | 11.2" | 6.73" | 641 |
| 285/65R18 | 32.59" | 11.2" | 7.29" | 619 |
| 285/70R18 | 33.71" | 11.2" | 7.85" | 598 |
| 285/75R18 | 34.83" | 11.2" | 8.42" | 579 |
| 33x11.50R18 | 33.00" | 11.5" | 7.50" | 611 |
| 35x11.50R18 | 35.00" | 11.5" | 8.50" | 576 |
| 37x11.50R18 | 37.00" | 11.5" | 9.50" | 545 |
| 38x11.50R18 | 38.00" | 11.5" | 10.00" | 531 |
| 295/30R18 | 24.97" | 11.6" | 3.48" | 808 |
| 295/35R18 | 26.13" | 11.6" | 4.06" | 772 |
| 295/40R18 | 27.29" | 11.6" | 4.65" | 739 |
| 295/45R18 | 28.45" | 11.6" | 5.23" | 709 |
| 295/65R18 | 33.10" | 11.6" | 7.55" | 609 |
| 295/70R18 | 34.26" | 11.6" | 8.13" | 589 |
| 305/30R18 | 25.20" | 12.0" | 3.60" | 800 |
| 26x12.00R18 | 26.00" | 12.0" | 4.00" | 776 |
| 305/35R18 | 26.41" | 12.0" | 4.20" | 764 |
| 305/40R18 | 27.61" | 12.0" | 4.80" | 731 |
| 28x12.00R18 | 28.00" | 12.0" | 5.00" | 720 |
| 305/45R18 | 28.81" | 12.0" | 5.40" | 700 |
| 305/60R18 | 32.41" | 12.0" | 7.20" | 622 |
| 305/65R18 | 33.61" | 12.0" | 7.81" | 600 |
| 305/70R18 | 34.81" | 12.0" | 8.41" | 579 |
| 315/30R18 | 25.44" | 12.4" | 3.72" | 793 |
| 315/35R18 | 26.68" | 12.4" | 4.34" | 756 |
| 315/40R18 | 27.92" | 12.4" | 4.96" | 722 |
| 315/70R18 | 35.36" | 12.4" | 8.68" | 570 |
| 33x12.50R18 | 33.00" | 12.5" | 7.50" | 611 |
| 34x12.50R18 | 34.00" | 12.5" | 8.00" | 593 |
| 35x12.50R18 | 35.00" | 12.5" | 8.50" | 576 |
| 37x12.50R18 | 37.00" | 12.5" | 9.50" | 545 |
| 325/35R18 | 26.96" | 12.8" | 4.48" | 748 |
| 325/45R18 | 29.52" | 12.8" | 5.76" | 683 |
| 325/60R18 | 33.35" | 12.8" | 7.68" | 605 |
| 325/65R18 | 34.63" | 12.8" | 8.32" | 582 |
| 33x13.00R18 | 33.00" | 13.0" | 7.50" | 611 |
| 35x13.00R18 | 35.00" | 13.0" | 8.50" | 576 |
| 335/30R18 | 25.91" | 13.2" | 3.96" | 778 |
| 33x13.50R18 | 33.00" | 13.5" | 7.50" | 611 |
| 35x13.50R18 | 35.00" | 13.5" | 8.50" | 576 |
| 36x13.50R18 | 36.00" | 13.5" | 9.00" | 560 |
| 37x13.50R18 | 37.00" | 13.5" | 9.50" | 545 |
| 38x13.50R18 | 38.00" | 13.5" | 10.00" | 531 |
| 40x13.50R18 | 40.00" | 13.5" | 11.00" | 504 |
| 345/30R18 | 26.15" | 13.6" | 4.07" | 771 |
| 345/35R18 | 27.51" | 13.6" | 4.75" | 733 |
| 355/65R18 | 36.17" | 14.0" | 9.08" | 558 |
| 35x14.50R18 | 35.00" | 14.5" | 8.50" | 576 |
| 37x14.50R18 | 37.00" | 14.5" | 9.50" | 545 |
| 38x14.50R18 | 38.00" | 14.5" | 10.00" | 531 |
| 38.5x14.50R18 | 38.50" | 14.5" | 10.25" | 524 |
| 40x14.50R18 | 40.00" | 14.5" | 11.00" | 504 |
| 41x14.50R18 | 41.00" | 14.5" | 11.50" | 492 |
| 38x15.00R18 | 38.00" | 15.0" | 10.00" | 531 |
| 38x15.50R18 | 38.00" | 15.5" | 10.00" | 531 |