Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.73 (628.2) | 25.09 (637.2) | 0.35 (9) 1.4% |
| Width inches (mm) | 11.22 (285) | 8.86 (225) | -2.36 (-60) -21.1% |
| Circum. inches (mm) | 77.7 (1973.55) | 78.81 (2001.82) | 1.11 (28.27) 1.4% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.54 (90) | 0.18 (4.5) 5.3% |
| Revolutions per mile (km) | 815.46 (506.7) | 803.94 (499.54) | -11.52 (-7.16) -1.4% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.29 mph (32.65 km/h) |
| 25 mph (40.23 km/h) | 25.36 mph (40.81 km/h) |
| 30 mph (48.28 km/h) | 30.43 mph (48.97 km/h) |
| 35 mph (56.33 km/h) | 35.5 mph (57.13 km/h) |
| 40 mph (64.37 km/h) | 40.57 mph (65.3 km/h) |
| 45 mph (72.42 km/h) | 45.64 mph (73.46 km/h) |
| 50 mph (80.47 km/h) | 50.72 mph (81.62 km/h) |
| 55 mph (88.51 km/h) | 55.79 mph (89.78 km/h) |
| 60 mph (96.56 km/h) | 60.86 mph (97.94 km/h) |
| 65 mph (104.61 km/h) | 65.93 mph (106.11 km/h) |
| 70 mph (112.65 km/h) | 71 mph (114.27 km/h) |
| 75 mph (120.7 km/h) | 76.07 mph (122.43 km/h) |
| 80 mph (128.75 km/h) | 81.15 mph (130.59 km/h) |
| 85 mph (136.79 km/h) | 86.22 mph (138.75 km/h) |
| 90 mph (144.84 km/h) | 91.29 mph (146.92 km/h) |
| 95 mph (152.89 km/h) | 96.36 mph (155.08 km/h) |
| 100 mph (160.93 km/h) | 101.43 mph (163.24 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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