Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/35-18 | 255/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.75 (628.7) | 26.03 (661.2) | 1.28 (32.5) 5.2% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 77.76 (1975.12) | 81.78 (2077.22) | 4.02 (102.1) 5.2% |
| Sidewall Height inches (mm) | 3.38 (85.75) | 4.02 (102) | 0.64 (16.25) 19% |
| Revolutions per mile (km) | 814.81 (506.3) | 774.76 (481.41) | -40.05 (-24.89) -4.9% |
255/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.03 mph (33.85 km/h) |
| 25 mph (40.23 km/h) | 26.29 mph (42.31 km/h) |
| 30 mph (48.28 km/h) | 31.55 mph (50.78 km/h) |
| 35 mph (56.33 km/h) | 36.81 mph (59.24 km/h) |
| 40 mph (64.37 km/h) | 42.07 mph (67.7 km/h) |
| 45 mph (72.42 km/h) | 47.33 mph (76.16 km/h) |
| 50 mph (80.47 km/h) | 52.58 mph (84.63 km/h) |
| 55 mph (88.51 km/h) | 57.84 mph (93.09 km/h) |
| 60 mph (96.56 km/h) | 63.1 mph (101.55 km/h) |
| 65 mph (104.61 km/h) | 68.36 mph (110.02 km/h) |
| 70 mph (112.65 km/h) | 73.62 mph (118.48 km/h) |
| 75 mph (120.7 km/h) | 78.88 mph (126.94 km/h) |
| 80 mph (128.75 km/h) | 84.14 mph (135.4 km/h) |
| 85 mph (136.79 km/h) | 89.39 mph (143.87 km/h) |
| 90 mph (144.84 km/h) | 94.65 mph (152.33 km/h) |
| 95 mph (152.89 km/h) | 99.91 mph (160.79 km/h) |
| 100 mph (160.93 km/h) | 105.17 mph (169.25 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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