Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/60-18 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.99 (787.2) | 33.21 (843.5) | 2.22 (56.3) 7.2% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 97.36 (2473.06) | 104.33 (2649.93) | 6.96 (176.87) 7.2% |
| Sidewall Height inches (mm) | 6.5 (165) | 6.6 (167.75) | 0.11 (2.75) 1.7% |
| Revolutions per mile (km) | 650.75 (404.36) | 607.31 (377.37) | -43.43 (-26.99) -6.7% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.43 mph (34.49 km/h) |
| 25 mph (40.23 km/h) | 26.79 mph (43.11 km/h) |
| 30 mph (48.28 km/h) | 32.15 mph (51.73 km/h) |
| 35 mph (56.33 km/h) | 37.5 mph (60.36 km/h) |
| 40 mph (64.37 km/h) | 42.86 mph (68.98 km/h) |
| 45 mph (72.42 km/h) | 48.22 mph (77.6 km/h) |
| 50 mph (80.47 km/h) | 53.58 mph (86.22 km/h) |
| 55 mph (88.51 km/h) | 58.93 mph (94.84 km/h) |
| 60 mph (96.56 km/h) | 64.29 mph (103.47 km/h) |
| 65 mph (104.61 km/h) | 69.65 mph (112.09 km/h) |
| 70 mph (112.65 km/h) | 75.01 mph (120.71 km/h) |
| 75 mph (120.7 km/h) | 80.36 mph (129.33 km/h) |
| 80 mph (128.75 km/h) | 85.72 mph (137.96 km/h) |
| 85 mph (136.79 km/h) | 91.08 mph (146.58 km/h) |
| 90 mph (144.84 km/h) | 96.44 mph (155.2 km/h) |
| 95 mph (152.89 km/h) | 101.79 mph (163.82 km/h) |
| 100 mph (160.93 km/h) | 107.15 mph (172.44 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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