Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.72) | 33.21 (843.5) | 0.19 (4.78) 0.6% |
| Width inches (mm) | 12.52 (318) | 12.01 (305) | -0.51 (-13) -4.1% |
| Circum. inches (mm) | 103.74 (2634.92) | 104.33 (2649.93) | 0.59 (15.02) 0.6% |
| Sidewall Height inches (mm) | 6.51 (165.36) | 6.6 (167.75) | 0.09 (2.39) 1.4% |
| Revolutions per mile (km) | 610.78 (379.52) | 607.31 (377.37) | -3.46 (-2.15) -0.6% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.11 mph (32.37 km/h) |
| 25 mph (40.23 km/h) | 25.14 mph (40.46 km/h) |
| 30 mph (48.28 km/h) | 30.17 mph (48.56 km/h) |
| 35 mph (56.33 km/h) | 35.2 mph (56.65 km/h) |
| 40 mph (64.37 km/h) | 40.23 mph (64.74 km/h) |
| 45 mph (72.42 km/h) | 45.26 mph (72.83 km/h) |
| 50 mph (80.47 km/h) | 50.28 mph (80.93 km/h) |
| 55 mph (88.51 km/h) | 55.31 mph (89.02 km/h) |
| 60 mph (96.56 km/h) | 60.34 mph (97.11 km/h) |
| 65 mph (104.61 km/h) | 65.37 mph (105.2 km/h) |
| 70 mph (112.65 km/h) | 70.4 mph (113.3 km/h) |
| 75 mph (120.7 km/h) | 75.43 mph (121.39 km/h) |
| 80 mph (128.75 km/h) | 80.46 mph (129.48 km/h) |
| 85 mph (136.79 km/h) | 85.48 mph (137.57 km/h) |
| 90 mph (144.84 km/h) | 90.51 mph (145.67 km/h) |
| 95 mph (152.89 km/h) | 95.54 mph (153.76 km/h) |
| 100 mph (160.93 km/h) | 100.57 mph (161.85 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1546 | 1795 | 1934 | 2019 | 2111 | 2177 | 2249 | 2335 | 2453 | 2571 | 2703 | 2808 | 2999 | 3209 | 3374 | 3479 | 3538 | 3755 | 4058 | 4715 |
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