Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-19 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.76 (730.6) | 25.09 (637.2) | -3.68 (-93.4) -12.8% |
| Width inches (mm) | 6.1 (155) | 8.86 (225) | 2.76 (70) 45.2% |
| Circum. inches (mm) | 90.36 (2295.25) | 78.81 (2001.82) | -11.55 (-293.42) -12.8% |
| Sidewall Height inches (mm) | 4.88 (124) | 3.54 (90) | -1.34 (-34) -27.4% |
| Revolutions per mile (km) | 701.16 (435.68) | 803.94 (499.54) | 102.78 (63.86) 14.7% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.44 mph (28.07 km/h) |
| 25 mph (40.23 km/h) | 21.8 mph (35.09 km/h) |
| 30 mph (48.28 km/h) | 26.16 mph (42.11 km/h) |
| 35 mph (56.33 km/h) | 30.53 mph (49.13 km/h) |
| 40 mph (64.37 km/h) | 34.89 mph (56.14 km/h) |
| 45 mph (72.42 km/h) | 39.25 mph (63.16 km/h) |
| 50 mph (80.47 km/h) | 43.61 mph (70.18 km/h) |
| 55 mph (88.51 km/h) | 47.97 mph (77.2 km/h) |
| 60 mph (96.56 km/h) | 52.33 mph (84.22 km/h) |
| 65 mph (104.61 km/h) | 56.69 mph (91.23 km/h) |
| 70 mph (112.65 km/h) | 61.05 mph (98.25 km/h) |
| 75 mph (120.7 km/h) | 65.41 mph (105.27 km/h) |
| 80 mph (128.75 km/h) | 69.77 mph (112.29 km/h) |
| 85 mph (136.79 km/h) | 74.13 mph (119.31 km/h) |
| 90 mph (144.84 km/h) | 78.49 mph (126.32 km/h) |
| 95 mph (152.89 km/h) | 82.86 mph (133.34 km/h) |
| 100 mph (160.93 km/h) | 87.22 mph (140.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2046 | 2377 | 2560 | 2673 | 2795 | 2882 | 2977 | 3091 | 3247 | 3404 | 3578 | 3717 | 3970 | 4248 | 4466 | 4605 | 4684 | 4971 | 5372 | 6242 |
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