Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-20 | 265/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.18 (766.5) | 30.39 (771.9) | 0.21 (5.4) 0.7% |
| Width inches (mm) | 9.25 (235) | 10.43 (265) | 1.18 (30) 12.8% |
| Circum. inches (mm) | 94.8 (2408.03) | 95.47 (2425) | 0.67 (16.96) 0.7% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 4.69 (119.25) | -0.39 (-10) -7.7% |
| Revolutions per mile (km) | 668.32 (415.28) | 663.65 (412.37) | -4.68 (-2.91) -0.7% |
265/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.14 mph (32.41 km/h) |
| 25 mph (40.23 km/h) | 25.18 mph (40.52 km/h) |
| 30 mph (48.28 km/h) | 30.21 mph (48.62 km/h) |
| 35 mph (56.33 km/h) | 35.25 mph (56.72 km/h) |
| 40 mph (64.37 km/h) | 40.28 mph (64.83 km/h) |
| 45 mph (72.42 km/h) | 45.32 mph (72.93 km/h) |
| 50 mph (80.47 km/h) | 50.35 mph (81.03 km/h) |
| 55 mph (88.51 km/h) | 55.39 mph (89.14 km/h) |
| 60 mph (96.56 km/h) | 60.42 mph (97.24 km/h) |
| 65 mph (104.61 km/h) | 65.46 mph (105.34 km/h) |
| 70 mph (112.65 km/h) | 70.49 mph (113.45 km/h) |
| 75 mph (120.7 km/h) | 75.53 mph (121.55 km/h) |
| 80 mph (128.75 km/h) | 80.56 mph (129.65 km/h) |
| 85 mph (136.79 km/h) | 85.6 mph (137.76 km/h) |
| 90 mph (144.84 km/h) | 90.63 mph (145.86 km/h) |
| 95 mph (152.89 km/h) | 95.67 mph (153.97 km/h) |
| 100 mph (160.93 km/h) | 100.7 mph (162.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1689 | 1962 | 2113 | 2206 | 2307 | 2379 | 2458 | 2551 | 2681 | 2810 | 2954 | 3069 | 3277 | 3507 | 3687 | 3802 | 3866 | 4104 | 4434 | 5153 |
Better Fuel Economy Factory Ratios Increased Power
