Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/60-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.2) | 25.09 (637.2) | -4.02 (-102) -13.8% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 91.43 (2322.27) | 78.81 (2001.82) | -12.62 (-320.44) -13.8% |
| Sidewall Height inches (mm) | 5.55 (141) | 3.54 (90) | -2.01 (-51) -36.2% |
| Revolutions per mile (km) | 693.01 (430.61) | 803.94 (499.54) | 110.93 (68.93) 16% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.24 mph (27.75 km/h) |
| 25 mph (40.23 km/h) | 21.55 mph (34.68 km/h) |
| 30 mph (48.28 km/h) | 25.86 mph (41.62 km/h) |
| 35 mph (56.33 km/h) | 30.17 mph (48.55 km/h) |
| 40 mph (64.37 km/h) | 34.48 mph (55.49 km/h) |
| 45 mph (72.42 km/h) | 38.79 mph (62.43 km/h) |
| 50 mph (80.47 km/h) | 43.1 mph (69.36 km/h) |
| 55 mph (88.51 km/h) | 47.41 mph (76.3 km/h) |
| 60 mph (96.56 km/h) | 51.72 mph (83.24 km/h) |
| 65 mph (104.61 km/h) | 56.03 mph (90.17 km/h) |
| 70 mph (112.65 km/h) | 60.34 mph (97.11 km/h) |
| 75 mph (120.7 km/h) | 64.65 mph (104.05 km/h) |
| 80 mph (128.75 km/h) | 68.96 mph (110.98 km/h) |
| 85 mph (136.79 km/h) | 73.27 mph (117.92 km/h) |
| 90 mph (144.84 km/h) | 77.58 mph (124.86 km/h) |
| 95 mph (152.89 km/h) | 81.89 mph (131.79 km/h) |
| 100 mph (160.93 km/h) | 86.2 mph (138.73 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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