Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/55-18 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.91 (759.7) | 33.02 (838.72) | 3.11 (79.02) 10.4% |
| Width inches (mm) | 10.83 (275) | 12.52 (318) | 1.69 (43) 15.6% |
| Circum. inches (mm) | 93.96 (2386.67) | 103.74 (2634.92) | 9.77 (248.25) 10.4% |
| Sidewall Height inches (mm) | 5.95 (151.25) | 6.51 (165.36) | 0.56 (14.11) 9.3% |
| Revolutions per mile (km) | 674.31 (418.99) | 610.78 (379.52) | -63.53 (-39.48) -9.4% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.08 mph (35.53 km/h) |
| 25 mph (40.23 km/h) | 27.6 mph (44.42 km/h) |
| 30 mph (48.28 km/h) | 33.12 mph (53.3 km/h) |
| 35 mph (56.33 km/h) | 38.64 mph (62.19 km/h) |
| 40 mph (64.37 km/h) | 44.16 mph (71.07 km/h) |
| 45 mph (72.42 km/h) | 49.68 mph (79.95 km/h) |
| 50 mph (80.47 km/h) | 55.2 mph (88.84 km/h) |
| 55 mph (88.51 km/h) | 60.72 mph (97.72 km/h) |
| 60 mph (96.56 km/h) | 66.24 mph (106.6 km/h) |
| 65 mph (104.61 km/h) | 71.76 mph (115.49 km/h) |
| 70 mph (112.65 km/h) | 77.28 mph (124.37 km/h) |
| 75 mph (120.7 km/h) | 82.8 mph (133.26 km/h) |
| 80 mph (128.75 km/h) | 88.32 mph (142.14 km/h) |
| 85 mph (136.79 km/h) | 93.84 mph (151.02 km/h) |
| 90 mph (144.84 km/h) | 99.36 mph (159.91 km/h) |
| 95 mph (152.89 km/h) | 104.88 mph (168.79 km/h) |
| 100 mph (160.93 km/h) | 110.4 mph (177.67 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1554 | 1806 | 1945 | 2031 | 2123 | 2189 | 2262 | 2348 | 2467 | 2586 | 2718 | 2824 | 3016 | 3228 | 3393 | 3499 | 3558 | 3777 | 4081 | 4742 |
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