Most Common 21-inch – Tire Sizes
| Tire Size (mm) | Tire Size (Inch) | Overall Diameter | Tread With | Rim Size (H x W) | Sidewall Height | Circumference | Revs/mile (km) |
|---|---|---|---|---|---|---|---|
| 265/35R21 | 28.3x10.4R21 | 28.3" (718.9 mm) | 10.4" (265 mm) | 21" x 9.0-10.5" | 3.7" (92.8 mm) | 88.9" (2258.5 mm) | 712.6 (442.8) |
| 245/35R21 | 27.8x9.6R21 | 27.8" (704.9 mm) | 9.6" (245 mm) | 21" x 8.0-9.5" | 3.4" (85.8 mm) | 87.2" (2214.5 mm) | 726.7 (451.6) |
| 275/45R21 | 30.7x10.8R21 | 30.7" (780.9 mm) | 10.8" (275 mm) | 21" x 8.5-10.5" | 4.9" (123.8 mm) | 96.6" (2453.3 mm) | 656 (407.6) |
| 255/40R21 | 29x10R21 | 29" (737.4 mm) | 10" (255 mm) | 21" x 8.5-10.0" | 4" (102 mm) | 91.2" (2316.6 mm) | 694.7 (431.7) |
| 295/35R21 | 29.1x11.6R21 | 29.1" (739.9 mm) | 11.6" (295 mm) | 21" x 10.0-11.5" | 4.1" (103.3 mm) | 91.5" (2324.5 mm) | 692.4 (430.2) |
Tire Size Chart For 21-Inch Rims
| Tire Size (mm) | Tire Size (Inch) | Overall Diameter | Tread With | Rim Size (H x W) | Sidewall Height | Circumference | Revs/mile (km) |
|---|---|---|---|---|---|---|---|
| 235/30R21 | 26.6x9.3R21 | 26.6" (674.4 mm) | 9.3" (235 mm) | 21" x n/a | 2.8" (70.5 mm) | 83.4" (2118.7 mm) | 759.6 (472) |
| 235/35R21 | 27.5x9.3R21 | 27.5" (697.9 mm) | 9.3" (235 mm) | 21" x n/a | 3.2" (82.3 mm) | 86.3" (2192.5 mm) | 734 (456.1) |
| 235/45R21 | 29.3x9.3R21 | 29.3" (744.9 mm) | 9.3" (235 mm) | 21" x 7.5-9.0" | 4.2" (105.8 mm) | 92.1" (2340.2 mm) | 687.7 (427.3) |
| 245/30R21 | 26.8x9.6R21 | 26.8" (680.4 mm) | 9.6" (245 mm) | 21" x 8.0-9.0" | 2.9" (73.5 mm) | 84.2" (2137.5 mm) | 752.9 (467.8) |
| 245/35R21 | 27.8x9.6R21 | 27.8" (704.9 mm) | 9.6" (245 mm) | 21" x 8.0-9.5" | 3.4" (85.8 mm) | 87.2" (2214.5 mm) | 726.7 (451.6) |
| 245/40R21 | 28.7x9.6R21 | 28.7" (729.4 mm) | 9.6" (245 mm) | 21" x 8.0-9.5" | 3.9" (98 mm) | 90.2" (2291.5 mm) | 702.3 (436.4) |
| 245/45R21 | 29.7x9.6R21 | 29.7" (753.9 mm) | 9.6" (245 mm) | 21" x 7.5-9.0" | 4.3" (110.3 mm) | 93.2" (2368.4 mm) | 679.5 (422.2) |
| 255/30R21 | 27x10R21 | 27" (686.4 mm) | 10" (255 mm) | 21" x 8.5-9.5" | 3" (76.5 mm) | 84.9" (2156.4 mm) | 746.3 (463.7) |
| 255/35R21 | 28x10R21 | 28" (711.9 mm) | 10" (255 mm) | 21" x 8.5-10.0" | 3.5" (89.3 mm) | 88.1" (2236.5 mm) | 719.6 (447.1) |
| 255/40R21 | 29x10R21 | 29" (737.4 mm) | 10" (255 mm) | 21" x 8.5-10.0" | 4" (102 mm) | 91.2" (2316.6 mm) | 694.7 (431.7) |
| 255/45R21 | 30x10R21 | 30" (762.9 mm) | 10" (255 mm) | 21" x 9.5-11.0" | 4.5" (114.8 mm) | 94.4" (2396.7 mm) | 671.5 (417.2) |
| 255/50R21 | 31x10R21 | 31" (788.4 mm) | 10" (255 mm) | 21" x 7.0-9.0" | 5" (127.5 mm) | 97.5" (2476.8 mm) | 649.8 (403.7) |
| 265/30R21 | 27.3x10.4R21 | 27.3" (692.4 mm) | 10.4" (265 mm) | 21" x 9.0-10.0" | 3.1" (79.5 mm) | 85.6" (2175.2 mm) | 739.8 (459.7) |
| 265/35R21 | 28.3x10.4R21 | 28.3" (718.9 mm) | 10.4" (265 mm) | 21" x 9.0-10.5" | 3.7" (92.8 mm) | 88.9" (2258.5 mm) | 712.6 (442.8) |
| 265/40R21 | 29.3x10.4R21 | 29.3" (745.4 mm) | 10.4" (265 mm) | 21" x 9.0-10.5" | 4.2" (106 mm) | 92.2" (2341.7 mm) | 687.2 (427) |
| 265/45R21 | 30.4x10.4R21 | 30.4" (771.9 mm) | 10.4" (265 mm) | 21" x 8.5-10.0" | 4.7" (119.3 mm) | 95.5" (2425 mm) | 663.6 (412.4) |
| 275/25R21 | 26.4x10.8R21 | 26.4" (670.9 mm) | 10.8" (275 mm) | 21" x 10.0" | 2.7" (68.8 mm) | 83" (2107.7 mm) | 763.6 (474.5) |
| 275/30R21 | 27.5x10.8R21 | 27.5" (698.4 mm) | 10.8" (275 mm) | 21" x 9.0-10.0" | 3.2" (82.5 mm) | 86.4" (2194.1 mm) | 733.5 (455.8) |
| 275/35R21 | 28.6x10.8R21 | 28.6" (725.9 mm) | 10.8" (275 mm) | 21" x 9.0-11.0" | 3.8" (96.3 mm) | 89.8" (2280.5 mm) | 705.7 (438.5) |
| 275/40R21 | 29.7x10.8R21 | 29.7" (753.4 mm) | 10.8" (275 mm) | 21" x 9.0-11.0" | 4.3" (110 mm) | 93.2" (2366.9 mm) | 679.9 (422.5) |
| 275/45R21 | 30.7x10.8R21 | 30.7" (780.9 mm) | 10.8" (275 mm) | 21" x 8.5-10.5" | 4.9" (123.8 mm) | 96.6" (2453.3 mm) | 656 (407.6) |
| 275/50R21 | 31.8x10.8R21 | 31.8" (808.4 mm) | 10.8" (275 mm) | 21" x 7.5-9.5" | 5.4" (137.5 mm) | 100" (2539.7 mm) | 633.7 (393.8) |
| 275/55R21 | 32.9x10.8R21 | 32.9" (835.9 mm) | 10.8" (275 mm) | 21" x 7.5-9.5" | 6" (151.3 mm) | 103.4" (2626.1 mm) | 612.8 (380.8) |
| 285/30R21 | 27.7x11.2R21 | 27.7" (704.4 mm) | 11.2" (285 mm) | 21" x 9.5-10.5" | 3.4" (85.5 mm) | 87.1" (2212.9 mm) | 727.2 (451.9) |
| 285/35R21 | 28.9x11.2R21 | 28.9" (732.9 mm) | 11.2" (285 mm) | 21" x 9.5-11.0" | 3.9" (99.8 mm) | 90.6" (2302.5 mm) | 699 (434.3) |
| 285/40R21 | 30x11.2R21 | 30" (761.4 mm) | 11.2" (285 mm) | 21" x 9.5-11.0" | 4.5" (114 mm) | 94.2" (2392 mm) | 672.8 (418.1) |
| 285/45R21 | 31.1x11.2R21 | 31.1" (789.9 mm) | 11.2" (285 mm) | 21" x 9.0-10.5" | 5" (128.3 mm) | 97.7" (2481.5 mm) | 648.5 (403) |
| 295/25R21 | 26.8x11.6R21 | 26.8" (680.9 mm) | 11.6" (295 mm) | 21" x 10.0-11.0" | 2.9" (73.8 mm) | 84.2" (2139.1 mm) | 752.3 (467.5) |
| 295/30R21 | 28x11.6R21 | 28" (710.4 mm) | 11.6" (295 mm) | 21" x 10.0-11.0" | 3.5" (88.5 mm) | 87.9" (2231.8 mm) | 721.1 (448.1) |
| 295/35R21 | 29.1x11.6R21 | 29.1" (739.9 mm) | 11.6" (295 mm) | 21" x 10.0-11.5" | 4.1" (103.3 mm) | 91.5" (2324.5 mm) | 692.4 (430.2) |
| 295/40R21 | 30.3x11.6R21 | 30.3" (769.4 mm) | 11.6" (295 mm) | 21" x 10.0-11.5" | 4.6" (118 mm) | 95.2" (2417.1 mm) | 665.8 (413.7) |
| 305/25R21 | 27x12R21 | 27" (685.9 mm) | 12" (305 mm) | 21" x 10.5-11.5" | 3" (76.3 mm) | 84.8" (2154.8 mm) | 746.9 (464.1) |
| 305/30R21 | 28.2x12R21 | 28.2" (716.4 mm) | 12" (305 mm) | 21" x 10.5-11.5" | 3.6" (91.5 mm) | 88.6" (2250.6 mm) | 715.1 (444.3) |
| 305/35R21 | 29.4x12R21 | 29.4" (746.9 mm) | 12" (305 mm) | 21" x 10.0-12.0" | 4.2" (106.8 mm) | 92.4" (2346.5 mm) | 685.9 (426.2) |
| 315/30R21 | 28.4x12.4R21 | 28.4" (722.4 mm) | 12.4" (315 mm) | 21" x 10.5-11.5" | 3.7" (94.5 mm) | 89.3" (2269.5 mm) | 709.1 (440.6) |
| 315/35R21 | 29.7x12.4R21 | 29.7" (753.9 mm) | 12.4" (315 mm) | 21" x 10.5-12.5" | 4.3" (110.3 mm) | 93.2" (2368.4 mm) | 679.5 (422.2) |
| 315/40R21 | 30.9x12.4R21 | 30.9" (785.4 mm) | 12.4" (315 mm) | 21" x 10.5-12.5" | 5" (126 mm) | 97.1" (2467.4 mm) | 652.2 (405.3) |
| 315/45R21 | 32.2x12.4R21 | 32.2" (816.9 mm) | 12.4" (315 mm) | 21" x n/a | 5.6" (141.8 mm) | 101" (2566.4 mm) | 627.1 (389.7) |
| 325/25R21 | 27.4x12.8R21 | 27.4" (695.9 mm) | 12.8" (325 mm) | 21" x 11.5-12.5" | 3.2" (81.3 mm) | 86.1" (2186.2 mm) | 736.1 (457.4) |
| 325/30R21 | 28.7x12.8R21 | 28.7" (728.4 mm) | 12.8" (325 mm) | 21" x 11.0-12.0" | 3.8" (97.5 mm) | 90.1" (2288.3 mm) | 703.3 (437) |
| 325/40R21 | 31.2x12.8R21 | 31.2" (793.4 mm) | 12.8" (325 mm) | 21" x 11.0-13.0" | 5.1" (130 mm) | 98.1" (2492.5 mm) | 645.7 (401.2) |
| 355/25R21 | 28x14R21 | 28" (710.9 mm) | 14" (355 mm) | 21" x 12.5-13.5" | 3.5" (88.8 mm) | 87.9" (2233.4 mm) | 720.6 (447.8) |
| 375/20R21 | 26.9x14.8R21 | 26.9" (683.4 mm) | 14.8" (375 mm) | 21" x n/a | 3" (75 mm) | 84.5" (2147 mm) | 749.6 (465.8) |
