Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.33 (668.7) | 25.09 (637.2) | -1.24 (-31.5) -4.7% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 82.71 (2100.78) | 78.81 (2001.82) | -3.9 (-98.96) -4.7% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 3.54 (90) | -0.62 (-15.75) -14.9% |
| Revolutions per mile (km) | 766.07 (476.01) | 803.94 (499.54) | 37.87 (23.53) 4.9% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.06 mph (30.67 km/h) |
| 25 mph (40.23 km/h) | 23.82 mph (38.34 km/h) |
| 30 mph (48.28 km/h) | 28.59 mph (46.01 km/h) |
| 35 mph (56.33 km/h) | 33.35 mph (53.67 km/h) |
| 40 mph (64.37 km/h) | 38.12 mph (61.34 km/h) |
| 45 mph (72.42 km/h) | 42.88 mph (69.01 km/h) |
| 50 mph (80.47 km/h) | 47.64 mph (76.68 km/h) |
| 55 mph (88.51 km/h) | 52.41 mph (84.34 km/h) |
| 60 mph (96.56 km/h) | 57.17 mph (92.01 km/h) |
| 65 mph (104.61 km/h) | 61.94 mph (99.68 km/h) |
| 70 mph (112.65 km/h) | 66.7 mph (107.35 km/h) |
| 75 mph (120.7 km/h) | 71.47 mph (115.02 km/h) |
| 80 mph (128.75 km/h) | 76.23 mph (122.68 km/h) |
| 85 mph (136.79 km/h) | 81 mph (130.35 km/h) |
| 90 mph (144.84 km/h) | 85.76 mph (138.02 km/h) |
| 95 mph (152.89 km/h) | 90.52 mph (145.69 km/h) |
| 100 mph (160.93 km/h) | 95.29 mph (153.35 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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