Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/40-18 | 225/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.4 (645.2) | 28.63 (727.2) | 3.23 (82) 12.7% |
| Width inches (mm) | 9.25 (235) | 8.86 (225) | -0.39 (-10) -4.3% |
| Circum. inches (mm) | 79.8 (2026.96) | 89.94 (2284.57) | 10.14 (257.61) 12.7% |
| Sidewall Height inches (mm) | 3.7 (94) | 5.31 (135) | 1.61 (41) 43.6% |
| Revolutions per mile (km) | 793.97 (493.35) | 704.44 (437.72) | -89.53 (-55.63) -11.3% |
225/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.54 mph (36.28 km/h) |
| 25 mph (40.23 km/h) | 28.18 mph (45.35 km/h) |
| 30 mph (48.28 km/h) | 33.81 mph (54.42 km/h) |
| 35 mph (56.33 km/h) | 39.45 mph (63.49 km/h) |
| 40 mph (64.37 km/h) | 45.08 mph (72.56 km/h) |
| 45 mph (72.42 km/h) | 50.72 mph (81.62 km/h) |
| 50 mph (80.47 km/h) | 56.35 mph (90.69 km/h) |
| 55 mph (88.51 km/h) | 61.99 mph (99.76 km/h) |
| 60 mph (96.56 km/h) | 67.63 mph (108.83 km/h) |
| 65 mph (104.61 km/h) | 73.26 mph (117.9 km/h) |
| 70 mph (112.65 km/h) | 78.9 mph (126.97 km/h) |
| 75 mph (120.7 km/h) | 84.53 mph (136.04 km/h) |
| 80 mph (128.75 km/h) | 90.17 mph (145.11 km/h) |
| 85 mph (136.79 km/h) | 95.8 mph (154.18 km/h) |
| 90 mph (144.84 km/h) | 101.44 mph (163.25 km/h) |
| 95 mph (152.89 km/h) | 107.07 mph (172.32 km/h) |
| 100 mph (160.93 km/h) | 112.71 mph (181.39 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1793 | 2083 | 2243 | 2342 | 2449 | 2525 | 2609 | 2708 | 2845 | 2983 | 3135 | 3257 | 3479 | 3723 | 3913 | 4035 | 4104 | 4356 | 4707 | 5470 |
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