Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/70-18 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 33.21 (843.5) | 0.6 (15.3) 1.8% |
| Width inches (mm) | 10.43 (265) | 12.01 (305) | 1.57 (40) 15.1% |
| Circum. inches (mm) | 102.44 (2601.87) | 104.33 (2649.93) | 1.89 (48.07) 1.8% |
| Sidewall Height inches (mm) | 7.3 (185.5) | 6.6 (167.75) | -0.7 (-17.75) -9.6% |
| Revolutions per mile (km) | 618.53 (384.34) | 607.31 (377.37) | -11.22 (-6.97) -1.8% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.37 mph (32.78 km/h) |
| 25 mph (40.23 km/h) | 25.46 mph (40.98 km/h) |
| 30 mph (48.28 km/h) | 30.55 mph (49.17 km/h) |
| 35 mph (56.33 km/h) | 35.65 mph (57.37 km/h) |
| 40 mph (64.37 km/h) | 40.74 mph (65.56 km/h) |
| 45 mph (72.42 km/h) | 45.83 mph (73.76 km/h) |
| 50 mph (80.47 km/h) | 50.92 mph (81.95 km/h) |
| 55 mph (88.51 km/h) | 56.02 mph (90.15 km/h) |
| 60 mph (96.56 km/h) | 61.11 mph (98.34 km/h) |
| 65 mph (104.61 km/h) | 66.2 mph (106.54 km/h) |
| 70 mph (112.65 km/h) | 71.29 mph (114.74 km/h) |
| 75 mph (120.7 km/h) | 76.39 mph (122.93 km/h) |
| 80 mph (128.75 km/h) | 81.48 mph (131.13 km/h) |
| 85 mph (136.79 km/h) | 86.57 mph (139.32 km/h) |
| 90 mph (144.84 km/h) | 91.66 mph (147.52 km/h) |
| 95 mph (152.89 km/h) | 96.76 mph (155.71 km/h) |
| 100 mph (160.93 km/h) | 101.85 mph (163.91 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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