Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/65-18 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.03 (762.7) | 30.18 (766.5) | 0.15 (3.8) 0.5% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 94.33 (2396.09) | 94.8 (2408.03) | 0.47 (11.94) 0.5% |
| Sidewall Height inches (mm) | 6.01 (152.75) | 5.09 (129.25) | -0.93 (-23.5) -15.4% |
| Revolutions per mile (km) | 671.65 (417.35) | 668.32 (415.28) | -3.33 (-2.07) -0.5% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.1 mph (32.35 km/h) |
| 25 mph (40.23 km/h) | 25.12 mph (40.43 km/h) |
| 30 mph (48.28 km/h) | 30.15 mph (48.52 km/h) |
| 35 mph (56.33 km/h) | 35.17 mph (56.61 km/h) |
| 40 mph (64.37 km/h) | 40.2 mph (64.69 km/h) |
| 45 mph (72.42 km/h) | 45.22 mph (72.78 km/h) |
| 50 mph (80.47 km/h) | 50.25 mph (80.87 km/h) |
| 55 mph (88.51 km/h) | 55.27 mph (88.96 km/h) |
| 60 mph (96.56 km/h) | 60.3 mph (97.04 km/h) |
| 65 mph (104.61 km/h) | 65.32 mph (105.13 km/h) |
| 70 mph (112.65 km/h) | 70.35 mph (113.22 km/h) |
| 75 mph (120.7 km/h) | 75.37 mph (121.3 km/h) |
| 80 mph (128.75 km/h) | 80.4 mph (129.39 km/h) |
| 85 mph (136.79 km/h) | 85.42 mph (137.48 km/h) |
| 90 mph (144.84 km/h) | 90.45 mph (145.56 km/h) |
| 95 mph (152.89 km/h) | 95.47 mph (153.65 km/h) |
| 100 mph (160.93 km/h) | 100.5 mph (161.74 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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