Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-17 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.41 (797.8) | 33.21 (843.5) | 1.8 (45.7) 5.7% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 98.68 (2506.36) | 104.33 (2649.93) | 5.65 (143.57) 5.7% |
| Sidewall Height inches (mm) | 7.2 (183) | 6.6 (167.75) | -0.6 (-15.25) -8.3% |
| Revolutions per mile (km) | 642.1 (398.98) | 607.31 (377.37) | -34.79 (-21.62) -5.4% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.15 mph (34.03 km/h) |
| 25 mph (40.23 km/h) | 26.43 mph (42.54 km/h) |
| 30 mph (48.28 km/h) | 31.72 mph (51.05 km/h) |
| 35 mph (56.33 km/h) | 37 mph (59.55 km/h) |
| 40 mph (64.37 km/h) | 42.29 mph (68.06 km/h) |
| 45 mph (72.42 km/h) | 47.58 mph (76.57 km/h) |
| 50 mph (80.47 km/h) | 52.86 mph (85.08 km/h) |
| 55 mph (88.51 km/h) | 58.15 mph (93.58 km/h) |
| 60 mph (96.56 km/h) | 63.44 mph (102.09 km/h) |
| 65 mph (104.61 km/h) | 68.72 mph (110.6 km/h) |
| 70 mph (112.65 km/h) | 74.01 mph (119.11 km/h) |
| 75 mph (120.7 km/h) | 79.3 mph (127.62 km/h) |
| 80 mph (128.75 km/h) | 84.58 mph (136.12 km/h) |
| 85 mph (136.79 km/h) | 89.87 mph (144.63 km/h) |
| 90 mph (144.84 km/h) | 95.16 mph (153.14 km/h) |
| 95 mph (152.89 km/h) | 100.44 mph (161.65 km/h) |
| 100 mph (160.93 km/h) | 105.73 mph (170.15 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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