Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/60-18 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.57 (751.2) | 30.18 (766.5) | 0.6 (15.3) 2% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 92.91 (2359.96) | 94.8 (2408.03) | 1.89 (48.07) 2% |
| Sidewall Height inches (mm) | 5.79 (147) | 5.09 (129.25) | -0.7 (-17.75) -12.1% |
| Revolutions per mile (km) | 681.94 (423.73) | 668.32 (415.28) | -13.61 (-8.46) -2% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.41 mph (32.84 km/h) |
| 25 mph (40.23 km/h) | 25.51 mph (41.05 km/h) |
| 30 mph (48.28 km/h) | 30.61 mph (49.26 km/h) |
| 35 mph (56.33 km/h) | 35.71 mph (57.47 km/h) |
| 40 mph (64.37 km/h) | 40.81 mph (65.69 km/h) |
| 45 mph (72.42 km/h) | 45.92 mph (73.9 km/h) |
| 50 mph (80.47 km/h) | 51.02 mph (82.11 km/h) |
| 55 mph (88.51 km/h) | 56.12 mph (90.32 km/h) |
| 60 mph (96.56 km/h) | 61.22 mph (98.53 km/h) |
| 65 mph (104.61 km/h) | 66.32 mph (106.74 km/h) |
| 70 mph (112.65 km/h) | 71.43 mph (114.95 km/h) |
| 75 mph (120.7 km/h) | 76.53 mph (123.16 km/h) |
| 80 mph (128.75 km/h) | 81.63 mph (131.37 km/h) |
| 85 mph (136.79 km/h) | 86.73 mph (139.58 km/h) |
| 90 mph (144.84 km/h) | 91.83 mph (147.79 km/h) |
| 95 mph (152.89 km/h) | 96.93 mph (156 km/h) |
| 100 mph (160.93 km/h) | 102.04 mph (164.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1701 | 1976 | 2128 | 2222 | 2323 | 2396 | 2475 | 2569 | 2699 | 2830 | 2975 | 3090 | 3300 | 3532 | 3713 | 3829 | 3894 | 4132 | 4465 | 5189 |
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