Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/60-20 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.85 (682) | 28.18 (715.7) | 1.33 (33.7) 4.9% |
| Width inches (mm) | 5.71 (145) | 9.25 (235) | 3.54 (90) 62.1% |
| Circum. inches (mm) | 84.35 (2142.57) | 88.52 (2248.44) | 4.17 (105.87) 4.9% |
| Sidewall Height inches (mm) | 3.43 (87) | 5.09 (129.25) | 1.66 (42.25) 48.6% |
| Revolutions per mile (km) | 751.13 (466.73) | 715.76 (444.75) | -35.37 (-21.98) -4.7% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.99 mph (33.78 km/h) |
| 25 mph (40.23 km/h) | 26.24 mph (42.22 km/h) |
| 30 mph (48.28 km/h) | 31.48 mph (50.67 km/h) |
| 35 mph (56.33 km/h) | 36.73 mph (59.11 km/h) |
| 40 mph (64.37 km/h) | 41.98 mph (67.55 km/h) |
| 45 mph (72.42 km/h) | 47.22 mph (76 km/h) |
| 50 mph (80.47 km/h) | 52.47 mph (84.44 km/h) |
| 55 mph (88.51 km/h) | 57.72 mph (92.89 km/h) |
| 60 mph (96.56 km/h) | 62.96 mph (101.33 km/h) |
| 65 mph (104.61 km/h) | 68.21 mph (109.78 km/h) |
| 70 mph (112.65 km/h) | 73.46 mph (118.22 km/h) |
| 75 mph (120.7 km/h) | 78.71 mph (126.67 km/h) |
| 80 mph (128.75 km/h) | 83.95 mph (135.11 km/h) |
| 85 mph (136.79 km/h) | 89.2 mph (143.55 km/h) |
| 90 mph (144.84 km/h) | 94.45 mph (152 km/h) |
| 95 mph (152.89 km/h) | 99.69 mph (160.44 km/h) |
| 100 mph (160.93 km/h) | 104.94 mph (168.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
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