21-inch tire sizes
47 sizes made for 21" wheels, from 25.3" to 32.9" tall. Click a size for inches, equivalents and comparisons.
| Size | Diameter | Width | Sidewall | Revs/mile |
|---|---|---|---|---|
| 225/45R21 | 28.97" | 8.9" | 3.99" | 696 |
| 235/45R21 | 29.33" | 9.3" | 4.16" | 688 |
| 235/50R21 | 30.25" | 9.3" | 4.63" | 667 |
| 245/30R21 | 26.79" | 9.6" | 2.89" | 753 |
| 245/35R21 | 27.75" | 9.6" | 3.38" | 727 |
| 245/40R21 | 28.72" | 9.6" | 3.86" | 702 |
| 245/45R21 | 29.68" | 9.6" | 4.34" | 679 |
| 255/30R21 | 27.02" | 10.0" | 3.01" | 746 |
| 255/35R21 | 28.03" | 10.0" | 3.51" | 720 |
| 255/40R21 | 29.03" | 10.0" | 4.02" | 695 |
| 255/45R21 | 30.04" | 10.0" | 4.52" | 671 |
| 255/50R21 | 31.04" | 10.0" | 5.02" | 650 |
| 265/30R21 | 27.26" | 10.4" | 3.13" | 740 |
| 265/35R21 | 28.30" | 10.4" | 3.65" | 713 |
| 265/40R21 | 29.35" | 10.4" | 4.17" | 687 |
| 265/45R21 | 30.39" | 10.4" | 4.69" | 664 |
| 275/20R21 | 25.33" | 10.8" | 2.17" | 796 |
| 275/25R21 | 26.41" | 10.8" | 2.71" | 764 |
| 275/30R21 | 27.50" | 10.8" | 3.25" | 733 |
| 275/35R21 | 28.58" | 10.8" | 3.79" | 706 |
| 275/40R21 | 29.66" | 10.8" | 4.33" | 680 |
| 275/45R21 | 30.74" | 10.8" | 4.87" | 656 |
| 275/50R21 | 31.83" | 10.8" | 5.41" | 634 |
| 275/55R21 | 32.91" | 10.8" | 5.95" | 613 |
| 285/30R21 | 27.73" | 11.2" | 3.37" | 727 |
| 285/35R21 | 28.85" | 11.2" | 3.93" | 699 |
| 285/40R21 | 29.98" | 11.2" | 4.49" | 673 |
| 285/45R21 | 31.10" | 11.2" | 5.05" | 649 |
| 295/25R21 | 26.81" | 11.6" | 2.90" | 752 |
| 295/30R21 | 27.97" | 11.6" | 3.48" | 721 |
| 295/35R21 | 29.13" | 11.6" | 4.06" | 692 |
| 295/40R21 | 30.29" | 11.6" | 4.65" | 666 |
| 305/25R21 | 27.00" | 12.0" | 3.00" | 747 |
| 305/30R21 | 28.20" | 12.0" | 3.60" | 715 |
| 305/35R21 | 29.41" | 12.0" | 4.20" | 686 |
| 305/40R21 | 30.61" | 12.0" | 4.80" | 659 |
| 315/30R21 | 28.44" | 12.4" | 3.72" | 709 |
| 315/35R21 | 29.68" | 12.4" | 4.34" | 679 |
| 315/40R21 | 30.92" | 12.4" | 4.96" | 652 |
| 315/45R21 | 32.16" | 12.4" | 5.58" | 627 |
| 325/25R21 | 27.40" | 12.8" | 3.20" | 736 |
| 325/30R21 | 28.68" | 12.8" | 3.84" | 703 |
| 325/40R21 | 31.24" | 12.8" | 5.12" | 646 |
| 335/30R21 | 28.91" | 13.2" | 3.96" | 698 |
| 345/25R21 | 27.79" | 13.6" | 3.40" | 726 |
| 345/30R21 | 29.15" | 13.6" | 4.07" | 692 |
| 355/25R21 | 27.99" | 14.0" | 3.49" | 721 |