Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-18 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.81 (731.7) | 26.66 (677.2) | -2.15 (-54.5) -7.4% |
| Width inches (mm) | 12.01 (305) | 10.83 (275) | -1.18 (-30) -9.8% |
| Circum. inches (mm) | 90.5 (2298.7) | 83.76 (2127.49) | -6.74 (-171.22) -7.4% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 4.33 (110) | -1.07 (-27.25) -19.9% |
| Revolutions per mile (km) | 700.11 (435.03) | 756.45 (470.04) | 56.34 (35.01) 8% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.51 mph (29.79 km/h) |
| 25 mph (40.23 km/h) | 23.14 mph (37.24 km/h) |
| 30 mph (48.28 km/h) | 27.77 mph (44.68 km/h) |
| 35 mph (56.33 km/h) | 32.39 mph (52.13 km/h) |
| 40 mph (64.37 km/h) | 37.02 mph (59.58 km/h) |
| 45 mph (72.42 km/h) | 41.65 mph (67.03 km/h) |
| 50 mph (80.47 km/h) | 46.28 mph (74.47 km/h) |
| 55 mph (88.51 km/h) | 50.9 mph (81.92 km/h) |
| 60 mph (96.56 km/h) | 55.53 mph (89.37 km/h) |
| 65 mph (104.61 km/h) | 60.16 mph (96.82 km/h) |
| 70 mph (112.65 km/h) | 64.79 mph (104.26 km/h) |
| 75 mph (120.7 km/h) | 69.41 mph (111.71 km/h) |
| 80 mph (128.75 km/h) | 74.04 mph (119.16 km/h) |
| 85 mph (136.79 km/h) | 78.67 mph (126.61 km/h) |
| 90 mph (144.84 km/h) | 83.3 mph (134.05 km/h) |
| 95 mph (152.89 km/h) | 87.92 mph (141.5 km/h) |
| 100 mph (160.93 km/h) | 92.55 mph (148.95 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1925 | 2236 | 2408 | 2515 | 2630 | 2711 | 2802 | 2908 | 3055 | 3203 | 3367 | 3498 | 3735 | 3998 | 4202 | 4333 | 4407 | 4677 | 5054 | 5873 |
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