Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/40-18 | 255/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.09 (637.2) | 26.03 (661.2) | 0.94 (24) 3.8% |
| Width inches (mm) | 8.86 (225) | 10.04 (255) | 1.18 (30) 13.3% |
| Circum. inches (mm) | 78.81 (2001.82) | 81.78 (2077.22) | 2.97 (75.4) 3.8% |
| Sidewall Height inches (mm) | 3.54 (90) | 4.02 (102) | 0.47 (12) 13.3% |
| Revolutions per mile (km) | 803.94 (499.54) | 774.76 (481.41) | -29.18 (-18.13) -3.6% |
255/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.75 mph (33.4 km/h) |
| 25 mph (40.23 km/h) | 25.94 mph (41.75 km/h) |
| 30 mph (48.28 km/h) | 31.13 mph (50.1 km/h) |
| 35 mph (56.33 km/h) | 36.32 mph (58.45 km/h) |
| 40 mph (64.37 km/h) | 41.51 mph (66.8 km/h) |
| 45 mph (72.42 km/h) | 46.69 mph (75.15 km/h) |
| 50 mph (80.47 km/h) | 51.88 mph (83.5 km/h) |
| 55 mph (88.51 km/h) | 57.07 mph (91.85 km/h) |
| 60 mph (96.56 km/h) | 62.26 mph (100.2 km/h) |
| 65 mph (104.61 km/h) | 67.45 mph (108.55 km/h) |
| 70 mph (112.65 km/h) | 72.64 mph (116.9 km/h) |
| 75 mph (120.7 km/h) | 77.82 mph (125.25 km/h) |
| 80 mph (128.75 km/h) | 83.01 mph (133.6 km/h) |
| 85 mph (136.79 km/h) | 88.2 mph (141.95 km/h) |
| 90 mph (144.84 km/h) | 93.39 mph (150.3 km/h) |
| 95 mph (152.89 km/h) | 98.58 mph (158.65 km/h) |
| 100 mph (160.93 km/h) | 103.77 mph (167 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1972 | 2290 | 2467 | 2576 | 2693 | 2777 | 2869 | 2978 | 3129 | 3280 | 3448 | 3582 | 3826 | 4094 | 4304 | 4438 | 4514 | 4791 | 5177 | 6016 |
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