Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/40-18 | 255/40-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.4 (645.2) | 25.03 (635.8) | -0.37 (-9.4) -1.5% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 79.8 (2026.96) | 78.64 (1997.42) | -1.16 (-29.53) -1.5% |
| Sidewall Height inches (mm) | 3.7 (94) | 4.02 (102) | 0.31 (8) 8.5% |
| Revolutions per mile (km) | 793.97 (493.35) | 805.71 (500.64) | 11.74 (7.29) 1.5% |
255/40-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.71 mph (31.72 km/h) |
| 25 mph (40.23 km/h) | 24.64 mph (39.65 km/h) |
| 30 mph (48.28 km/h) | 29.56 mph (47.58 km/h) |
| 35 mph (56.33 km/h) | 34.49 mph (55.51 km/h) |
| 40 mph (64.37 km/h) | 39.42 mph (63.44 km/h) |
| 45 mph (72.42 km/h) | 44.34 mph (71.37 km/h) |
| 50 mph (80.47 km/h) | 49.27 mph (79.3 km/h) |
| 55 mph (88.51 km/h) | 54.2 mph (87.22 km/h) |
| 60 mph (96.56 km/h) | 59.13 mph (95.15 km/h) |
| 65 mph (104.61 km/h) | 64.05 mph (103.08 km/h) |
| 70 mph (112.65 km/h) | 68.98 mph (111.01 km/h) |
| 75 mph (120.7 km/h) | 73.91 mph (118.94 km/h) |
| 80 mph (128.75 km/h) | 78.83 mph (126.87 km/h) |
| 85 mph (136.79 km/h) | 83.76 mph (134.8 km/h) |
| 90 mph (144.84 km/h) | 88.69 mph (142.73 km/h) |
| 95 mph (152.89 km/h) | 93.62 mph (150.66 km/h) |
| 100 mph (160.93 km/h) | 98.54 mph (158.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2050 | 2382 | 2565 | 2679 | 2801 | 2888 | 2984 | 3097 | 3254 | 3411 | 3586 | 3726 | 3979 | 4258 | 4476 | 4616 | 4694 | 4982 | 5383 | 6256 |
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