Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 37/13.5-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.01 (940.18) | 33.21 (843.5) | -3.81 (-96.68) -10.3% |
| Width inches (mm) | 13.5 (343) | 12.01 (305) | -1.5 (-38) -11.1% |
| Circum. inches (mm) | 116.29 (2953.66) | 104.33 (2649.93) | -11.96 (-303.73) -10.3% |
| Sidewall Height inches (mm) | 8.51 (216.09) | 6.6 (167.75) | -1.9 (-48.34) -22.4% |
| Revolutions per mile (km) | 544.86 (338.56) | 607.31 (377.37) | 62.45 (38.81) 11.5% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.94 mph (28.88 km/h) |
| 25 mph (40.23 km/h) | 22.43 mph (36.1 km/h) |
| 30 mph (48.28 km/h) | 26.92 mph (43.32 km/h) |
| 35 mph (56.33 km/h) | 31.4 mph (50.53 km/h) |
| 40 mph (64.37 km/h) | 35.89 mph (57.75 km/h) |
| 45 mph (72.42 km/h) | 40.37 mph (64.97 km/h) |
| 50 mph (80.47 km/h) | 44.86 mph (72.19 km/h) |
| 55 mph (88.51 km/h) | 49.34 mph (79.41 km/h) |
| 60 mph (96.56 km/h) | 53.83 mph (86.63 km/h) |
| 65 mph (104.61 km/h) | 58.32 mph (93.85 km/h) |
| 70 mph (112.65 km/h) | 62.8 mph (101.07 km/h) |
| 75 mph (120.7 km/h) | 67.29 mph (108.29 km/h) |
| 80 mph (128.75 km/h) | 71.77 mph (115.51 km/h) |
| 85 mph (136.79 km/h) | 76.26 mph (122.73 km/h) |
| 90 mph (144.84 km/h) | 80.75 mph (129.95 km/h) |
| 95 mph (152.89 km/h) | 85.23 mph (137.17 km/h) |
| 100 mph (160.93 km/h) | 89.72 mph (144.39 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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