Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/40-20 | 235/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (696) | 28.33 (719.5) | 0.93 (23.5) 3.4% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 86.08 (2186.55) | 88.99 (2260.38) | 2.91 (73.83) 3.4% |
| Sidewall Height inches (mm) | 3.7 (94) | 4.16 (105.75) | 0.46 (11.75) 12.5% |
| Revolutions per mile (km) | 736.02 (457.34) | 711.98 (442.4) | -24.04 (-14.94) -3.3% |
235/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.68 mph (33.27 km/h) |
| 25 mph (40.23 km/h) | 25.84 mph (41.59 km/h) |
| 30 mph (48.28 km/h) | 31.01 mph (49.91 km/h) |
| 35 mph (56.33 km/h) | 36.18 mph (58.23 km/h) |
| 40 mph (64.37 km/h) | 41.35 mph (66.55 km/h) |
| 45 mph (72.42 km/h) | 46.52 mph (74.87 km/h) |
| 50 mph (80.47 km/h) | 51.69 mph (83.18 km/h) |
| 55 mph (88.51 km/h) | 56.86 mph (91.5 km/h) |
| 60 mph (96.56 km/h) | 62.03 mph (99.82 km/h) |
| 65 mph (104.61 km/h) | 67.19 mph (108.14 km/h) |
| 70 mph (112.65 km/h) | 72.36 mph (116.46 km/h) |
| 75 mph (120.7 km/h) | 77.53 mph (124.78 km/h) |
| 80 mph (128.75 km/h) | 82.7 mph (133.09 km/h) |
| 85 mph (136.79 km/h) | 87.87 mph (141.41 km/h) |
| 90 mph (144.84 km/h) | 93.04 mph (149.73 km/h) |
| 95 mph (152.89 km/h) | 98.21 mph (158.05 km/h) |
| 100 mph (160.93 km/h) | 103.38 mph (166.37 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
