Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/70-18 | 33/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.06 (814.2) | 33.02 (838.72) | 0.97 (24.52) 3% |
| Width inches (mm) | 10.04 (255) | 12.52 (318) | 2.48 (63) 24.7% |
| Circum. inches (mm) | 100.7 (2557.88) | 103.74 (2634.92) | 3.03 (77.03) 3% |
| Sidewall Height inches (mm) | 7.03 (178.5) | 6.51 (165.36) | -0.52 (-13.14) -7.4% |
| Revolutions per mile (km) | 629.17 (390.95) | 610.78 (379.52) | -18.39 (-11.43) -2.9% |
33/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.6 mph (33.16 km/h) |
| 25 mph (40.23 km/h) | 25.75 mph (41.45 km/h) |
| 30 mph (48.28 km/h) | 30.9 mph (49.73 km/h) |
| 35 mph (56.33 km/h) | 36.05 mph (58.02 km/h) |
| 40 mph (64.37 km/h) | 41.2 mph (66.31 km/h) |
| 45 mph (72.42 km/h) | 46.36 mph (74.6 km/h) |
| 50 mph (80.47 km/h) | 51.51 mph (82.89 km/h) |
| 55 mph (88.51 km/h) | 56.66 mph (91.18 km/h) |
| 60 mph (96.56 km/h) | 61.81 mph (99.47 km/h) |
| 65 mph (104.61 km/h) | 66.96 mph (107.76 km/h) |
| 70 mph (112.65 km/h) | 72.11 mph (116.05 km/h) |
| 75 mph (120.7 km/h) | 77.26 mph (124.34 km/h) |
| 80 mph (128.75 km/h) | 82.41 mph (132.63 km/h) |
| 85 mph (136.79 km/h) | 87.56 mph (140.91 km/h) |
| 90 mph (144.84 km/h) | 92.71 mph (149.2 km/h) |
| 95 mph (152.89 km/h) | 97.86 mph (157.49 km/h) |
| 100 mph (160.93 km/h) | 103.01 mph (165.78 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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