Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-20 | 235/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.33 (719.5) | 27.4 (696) | -0.93 (-23.5) -3.3% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 88.99 (2260.38) | 86.08 (2186.55) | -2.91 (-73.83) -3.3% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 3.7 (94) | -0.46 (-11.75) -11.1% |
| Revolutions per mile (km) | 711.98 (442.4) | 736.02 (457.34) | 24.04 (14.94) 3.4% |
235/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.35 mph (31.14 km/h) |
| 25 mph (40.23 km/h) | 24.18 mph (38.92 km/h) |
| 30 mph (48.28 km/h) | 29.02 mph (46.7 km/h) |
| 35 mph (56.33 km/h) | 33.86 mph (54.49 km/h) |
| 40 mph (64.37 km/h) | 38.69 mph (62.27 km/h) |
| 45 mph (72.42 km/h) | 43.53 mph (70.06 km/h) |
| 50 mph (80.47 km/h) | 48.37 mph (77.84 km/h) |
| 55 mph (88.51 km/h) | 53.2 mph (85.62 km/h) |
| 60 mph (96.56 km/h) | 58.04 mph (93.41 km/h) |
| 65 mph (104.61 km/h) | 62.88 mph (101.19 km/h) |
| 70 mph (112.65 km/h) | 67.71 mph (108.97 km/h) |
| 75 mph (120.7 km/h) | 72.55 mph (116.76 km/h) |
| 80 mph (128.75 km/h) | 77.39 mph (124.54 km/h) |
| 85 mph (136.79 km/h) | 82.22 mph (132.33 km/h) |
| 90 mph (144.84 km/h) | 87.06 mph (140.11 km/h) |
| 95 mph (152.89 km/h) | 91.9 mph (147.89 km/h) |
| 100 mph (160.93 km/h) | 96.73 mph (155.68 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1873 | 2176 | 2343 | 2447 | 2558 | 2638 | 2726 | 2829 | 2973 | 3116 | 3276 | 3403 | 3634 | 3890 | 4089 | 4216 | 4288 | 4551 | 4918 | 5715 |
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