Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-20 | 235/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.72 (704) | 28.33 (719.5) | 0.61 (15.5) 2.2% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 87.07 (2211.68) | 88.99 (2260.38) | 1.92 (48.69) 2.2% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.16 (105.75) | 0.31 (7.75) 7.9% |
| Revolutions per mile (km) | 727.66 (452.14) | 711.98 (442.4) | -15.68 (-9.74) -2.2% |
235/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.44 mph (32.9 km/h) |
| 25 mph (40.23 km/h) | 25.55 mph (41.12 km/h) |
| 30 mph (48.28 km/h) | 30.66 mph (49.34 km/h) |
| 35 mph (56.33 km/h) | 35.77 mph (57.57 km/h) |
| 40 mph (64.37 km/h) | 40.88 mph (65.79 km/h) |
| 45 mph (72.42 km/h) | 45.99 mph (74.02 km/h) |
| 50 mph (80.47 km/h) | 51.1 mph (82.24 km/h) |
| 55 mph (88.51 km/h) | 56.21 mph (90.46 km/h) |
| 60 mph (96.56 km/h) | 61.32 mph (98.69 km/h) |
| 65 mph (104.61 km/h) | 66.43 mph (106.91 km/h) |
| 70 mph (112.65 km/h) | 71.54 mph (115.13 km/h) |
| 75 mph (120.7 km/h) | 76.65 mph (123.36 km/h) |
| 80 mph (128.75 km/h) | 81.76 mph (131.58 km/h) |
| 85 mph (136.79 km/h) | 86.87 mph (139.81 km/h) |
| 90 mph (144.84 km/h) | 91.98 mph (148.03 km/h) |
| 95 mph (152.89 km/h) | 97.09 mph (156.25 km/h) |
| 100 mph (160.93 km/h) | 102.2 mph (164.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1812 | 2105 | 2267 | 2367 | 2475 | 2552 | 2637 | 2737 | 2876 | 3015 | 3169 | 3292 | 3516 | 3762 | 3955 | 4079 | 4148 | 4402 | 4757 | 5528 |
Better Fuel Economy Factory Ratios Increased Power
