Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/55-18 | 225/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.74 (704.7) | 25.09 (637.2) | -2.66 (-67.5) -9.6% |
| Width inches (mm) | 8.86 (225) | 8.86 (225) | 0 (0) 0% |
| Circum. inches (mm) | 87.16 (2213.88) | 78.81 (2001.82) | -8.35 (-212.06) -9.6% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 3.54 (90) | -1.33 (-33.75) -27.3% |
| Revolutions per mile (km) | 726.93 (451.69) | 803.94 (499.54) | 77.01 (47.85) 10.6% |
225/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.08 mph (29.1 km/h) |
| 25 mph (40.23 km/h) | 22.61 mph (36.38 km/h) |
| 30 mph (48.28 km/h) | 27.13 mph (43.66 km/h) |
| 35 mph (56.33 km/h) | 31.65 mph (50.93 km/h) |
| 40 mph (64.37 km/h) | 36.17 mph (58.21 km/h) |
| 45 mph (72.42 km/h) | 40.69 mph (65.48 km/h) |
| 50 mph (80.47 km/h) | 45.21 mph (72.76 km/h) |
| 55 mph (88.51 km/h) | 49.73 mph (80.04 km/h) |
| 60 mph (96.56 km/h) | 54.25 mph (87.31 km/h) |
| 65 mph (104.61 km/h) | 58.77 mph (94.59 km/h) |
| 70 mph (112.65 km/h) | 63.3 mph (101.86 km/h) |
| 75 mph (120.7 km/h) | 67.82 mph (109.14 km/h) |
| 80 mph (128.75 km/h) | 72.34 mph (116.42 km/h) |
| 85 mph (136.79 km/h) | 76.86 mph (123.69 km/h) |
| 90 mph (144.84 km/h) | 81.38 mph (130.97 km/h) |
| 95 mph (152.89 km/h) | 85.9 mph (138.24 km/h) |
| 100 mph (160.93 km/h) | 90.42 mph (145.52 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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