Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/25-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.2 (665.5) | 33.21 (843.5) | 7.01 (178) 26.7% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 82.31 (2090.73) | 104.33 (2649.93) | 22.02 (559.2) 26.7% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 6.6 (167.75) | 3.5 (89) 113% |
| Revolutions per mile (km) | 769.75 (478.3) | 607.31 (377.37) | -162.44 (-100.93) -21.1% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.35 mph (40.8 km/h) |
| 25 mph (40.23 km/h) | 31.69 mph (50.99 km/h) |
| 30 mph (48.28 km/h) | 38.02 mph (61.19 km/h) |
| 35 mph (56.33 km/h) | 44.36 mph (71.39 km/h) |
| 40 mph (64.37 km/h) | 50.7 mph (81.59 km/h) |
| 45 mph (72.42 km/h) | 57.04 mph (91.79 km/h) |
| 50 mph (80.47 km/h) | 63.37 mph (101.99 km/h) |
| 55 mph (88.51 km/h) | 69.71 mph (112.19 km/h) |
| 60 mph (96.56 km/h) | 76.05 mph (122.39 km/h) |
| 65 mph (104.61 km/h) | 82.39 mph (132.59 km/h) |
| 70 mph (112.65 km/h) | 88.72 mph (142.79 km/h) |
| 75 mph (120.7 km/h) | 95.06 mph (152.98 km/h) |
| 80 mph (128.75 km/h) | 101.4 mph (163.18 km/h) |
| 85 mph (136.79 km/h) | 107.73 mph (173.38 km/h) |
| 90 mph (144.84 km/h) | 114.07 mph (183.58 km/h) |
| 95 mph (152.89 km/h) | 120.41 mph (193.78 km/h) |
| 100 mph (160.93 km/h) | 126.75 mph (203.98 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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