Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-21 | 235/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.33 (744.9) | 29.25 (743) | -0.07 (-1.9) -0.3% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 92.13 (2340.17) | 91.9 (2334.2) | -0.24 (-5.97) -0.3% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 4.63 (117.5) | 0.46 (11.75) 11.1% |
| Revolutions per mile (km) | 687.7 (427.32) | 689.46 (428.41) | 1.76 (1.09) 0.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.95 mph (32.1 km/h) |
| 25 mph (40.23 km/h) | 24.94 mph (40.13 km/h) |
| 30 mph (48.28 km/h) | 29.92 mph (48.16 km/h) |
| 35 mph (56.33 km/h) | 34.91 mph (56.18 km/h) |
| 40 mph (64.37 km/h) | 39.9 mph (64.21 km/h) |
| 45 mph (72.42 km/h) | 44.89 mph (72.24 km/h) |
| 50 mph (80.47 km/h) | 49.87 mph (80.26 km/h) |
| 55 mph (88.51 km/h) | 54.86 mph (88.29 km/h) |
| 60 mph (96.56 km/h) | 59.85 mph (96.31 km/h) |
| 65 mph (104.61 km/h) | 64.83 mph (104.34 km/h) |
| 70 mph (112.65 km/h) | 69.82 mph (112.37 km/h) |
| 75 mph (120.7 km/h) | 74.81 mph (120.39 km/h) |
| 80 mph (128.75 km/h) | 79.8 mph (128.42 km/h) |
| 85 mph (136.79 km/h) | 84.78 mph (136.45 km/h) |
| 90 mph (144.84 km/h) | 89.77 mph (144.47 km/h) |
| 95 mph (152.89 km/h) | 94.76 mph (152.5 km/h) |
| 100 mph (160.93 km/h) | 99.74 mph (160.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1755 | 2038 | 2195 | 2292 | 2397 | 2471 | 2553 | 2650 | 2785 | 2919 | 3069 | 3188 | 3405 | 3643 | 3830 | 3950 | 4017 | 4263 | 4607 | 5353 |
Better Fuel Economy Factory Ratios Increased Power
