Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/40-17 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.92 (683.8) | 26.66 (677.2) | -0.26 (-6.6) -1% |
| Width inches (mm) | 12.4 (315) | 10.83 (275) | -1.57 (-40) -12.7% |
| Circum. inches (mm) | 84.58 (2148.22) | 83.76 (2127.49) | -0.82 (-20.73) -1% |
| Sidewall Height inches (mm) | 4.96 (126) | 4.33 (110) | -0.63 (-16) -12.7% |
| Revolutions per mile (km) | 749.15 (465.5) | 756.45 (470.04) | 7.3 (4.54) 1% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.81 mph (31.88 km/h) |
| 25 mph (40.23 km/h) | 24.76 mph (39.85 km/h) |
| 30 mph (48.28 km/h) | 29.71 mph (47.81 km/h) |
| 35 mph (56.33 km/h) | 34.66 mph (55.78 km/h) |
| 40 mph (64.37 km/h) | 39.61 mph (63.75 km/h) |
| 45 mph (72.42 km/h) | 44.57 mph (71.72 km/h) |
| 50 mph (80.47 km/h) | 49.52 mph (79.69 km/h) |
| 55 mph (88.51 km/h) | 54.47 mph (87.66 km/h) |
| 60 mph (96.56 km/h) | 59.42 mph (95.63 km/h) |
| 65 mph (104.61 km/h) | 64.37 mph (103.6 km/h) |
| 70 mph (112.65 km/h) | 69.32 mph (111.57 km/h) |
| 75 mph (120.7 km/h) | 74.28 mph (119.54 km/h) |
| 80 mph (128.75 km/h) | 79.23 mph (127.51 km/h) |
| 85 mph (136.79 km/h) | 84.18 mph (135.47 km/h) |
| 90 mph (144.84 km/h) | 89.13 mph (143.44 km/h) |
| 95 mph (152.89 km/h) | 94.08 mph (151.41 km/h) |
| 100 mph (160.93 km/h) | 99.03 mph (159.38 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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