Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 36.81 (935) | 33.21 (843.5) | -3.6 (-91.5) -9.8% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 115.65 (2937.39) | 104.33 (2649.93) | -11.32 (-287.46) -9.8% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 6.6 (167.75) | -1.8 (-45.75) -21.4% |
| Revolutions per mile (km) | 547.88 (340.44) | 607.31 (377.37) | 59.43 (36.93) 10.8% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.04 mph (29.04 km/h) |
| 25 mph (40.23 km/h) | 22.55 mph (36.3 km/h) |
| 30 mph (48.28 km/h) | 27.06 mph (43.56 km/h) |
| 35 mph (56.33 km/h) | 31.57 mph (50.81 km/h) |
| 40 mph (64.37 km/h) | 36.09 mph (58.07 km/h) |
| 45 mph (72.42 km/h) | 40.6 mph (65.33 km/h) |
| 50 mph (80.47 km/h) | 45.11 mph (72.59 km/h) |
| 55 mph (88.51 km/h) | 49.62 mph (79.85 km/h) |
| 60 mph (96.56 km/h) | 54.13 mph (87.11 km/h) |
| 65 mph (104.61 km/h) | 58.64 mph (94.37 km/h) |
| 70 mph (112.65 km/h) | 63.15 mph (101.63 km/h) |
| 75 mph (120.7 km/h) | 67.66 mph (108.89 km/h) |
| 80 mph (128.75 km/h) | 72.17 mph (116.15 km/h) |
| 85 mph (136.79 km/h) | 76.68 mph (123.41 km/h) |
| 90 mph (144.84 km/h) | 81.19 mph (130.67 km/h) |
| 95 mph (152.89 km/h) | 85.7 mph (137.93 km/h) |
| 100 mph (160.93 km/h) | 90.21 mph (145.19 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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