Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/70-18 | 305/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.16 (842.2) | 36.01 (914.7) | 2.85 (72.5) 8.6% |
| Width inches (mm) | 10.83 (275) | 12.01 (305) | 1.18 (30) 10.9% |
| Circum. inches (mm) | 104.17 (2645.85) | 113.13 (2873.61) | 8.97 (227.77) 8.6% |
| Sidewall Height inches (mm) | 7.58 (192.5) | 9.01 (228.75) | 1.43 (36.25) 18.8% |
| Revolutions per mile (km) | 608.25 (377.95) | 560.04 (347.99) | -48.21 (-29.96) -7.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.72 mph (34.96 km/h) |
| 25 mph (40.23 km/h) | 27.15 mph (43.7 km/h) |
| 30 mph (48.28 km/h) | 32.58 mph (52.44 km/h) |
| 35 mph (56.33 km/h) | 38.01 mph (61.18 km/h) |
| 40 mph (64.37 km/h) | 43.44 mph (69.92 km/h) |
| 45 mph (72.42 km/h) | 48.87 mph (78.65 km/h) |
| 50 mph (80.47 km/h) | 54.3 mph (87.39 km/h) |
| 55 mph (88.51 km/h) | 59.73 mph (96.13 km/h) |
| 60 mph (96.56 km/h) | 65.17 mph (104.87 km/h) |
| 65 mph (104.61 km/h) | 70.6 mph (113.61 km/h) |
| 70 mph (112.65 km/h) | 76.03 mph (122.35 km/h) |
| 75 mph (120.7 km/h) | 81.46 mph (131.09 km/h) |
| 80 mph (128.75 km/h) | 86.89 mph (139.83 km/h) |
| 85 mph (136.79 km/h) | 92.32 mph (148.57 km/h) |
| 90 mph (144.84 km/h) | 97.75 mph (157.31 km/h) |
| 95 mph (152.89 km/h) | 103.18 mph (166.05 km/h) |
| 100 mph (160.93 km/h) | 108.61 mph (174.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1425 | 1656 | 1783 | 1862 | 1947 | 2007 | 2074 | 2153 | 2262 | 2371 | 2493 | 2590 | 2765 | 2960 | 3111 | 3208 | 3263 | 3463 | 3742 | 4348 |
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