Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/30-20 | 235/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.31 (643) | 27.4 (696) | 2.09 (53) 8.2% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 79.53 (2020.04) | 86.08 (2186.55) | 6.56 (166.5) 8.2% |
| Sidewall Height inches (mm) | 2.66 (67.5) | 3.7 (94) | 1.04 (26.5) 39.3% |
| Revolutions per mile (km) | 796.69 (495.04) | 736.02 (457.34) | -60.67 (-37.7) -7.6% |
235/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.65 mph (34.84 km/h) |
| 25 mph (40.23 km/h) | 27.06 mph (43.55 km/h) |
| 30 mph (48.28 km/h) | 32.47 mph (52.26 km/h) |
| 35 mph (56.33 km/h) | 37.88 mph (60.97 km/h) |
| 40 mph (64.37 km/h) | 43.3 mph (69.68 km/h) |
| 45 mph (72.42 km/h) | 48.71 mph (78.39 km/h) |
| 50 mph (80.47 km/h) | 54.12 mph (87.1 km/h) |
| 55 mph (88.51 km/h) | 59.53 mph (95.81 km/h) |
| 60 mph (96.56 km/h) | 64.95 mph (104.52 km/h) |
| 65 mph (104.61 km/h) | 70.36 mph (113.23 km/h) |
| 70 mph (112.65 km/h) | 75.77 mph (121.94 km/h) |
| 75 mph (120.7 km/h) | 81.18 mph (130.65 km/h) |
| 80 mph (128.75 km/h) | 86.59 mph (139.36 km/h) |
| 85 mph (136.79 km/h) | 92.01 mph (148.07 km/h) |
| 90 mph (144.84 km/h) | 97.42 mph (156.78 km/h) |
| 95 mph (152.89 km/h) | 102.83 mph (165.49 km/h) |
| 100 mph (160.93 km/h) | 108.24 mph (174.2 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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