Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 265/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 30.39 (771.9) | 1.36 (34.5) 4.7% |
| Width inches (mm) | 10.04 (255) | 10.43 (265) | 0.39 (10) 3.9% |
| Circum. inches (mm) | 91.21 (2316.61) | 95.47 (2425) | 4.27 (108.38) 4.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.69 (119.25) | 0.68 (17.25) 16.9% |
| Revolutions per mile (km) | 694.7 (431.66) | 663.65 (412.37) | -31.05 (-19.29) -4.5% |
265/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.94 mph (33.69 km/h) |
| 25 mph (40.23 km/h) | 26.17 mph (42.12 km/h) |
| 30 mph (48.28 km/h) | 31.4 mph (50.54 km/h) |
| 35 mph (56.33 km/h) | 36.64 mph (58.96 km/h) |
| 40 mph (64.37 km/h) | 41.87 mph (67.39 km/h) |
| 45 mph (72.42 km/h) | 47.11 mph (75.81 km/h) |
| 50 mph (80.47 km/h) | 52.34 mph (84.23 km/h) |
| 55 mph (88.51 km/h) | 57.57 mph (92.66 km/h) |
| 60 mph (96.56 km/h) | 62.81 mph (101.08 km/h) |
| 65 mph (104.61 km/h) | 68.04 mph (109.5 km/h) |
| 70 mph (112.65 km/h) | 73.28 mph (117.92 km/h) |
| 75 mph (120.7 km/h) | 78.51 mph (126.35 km/h) |
| 80 mph (128.75 km/h) | 83.74 mph (134.77 km/h) |
| 85 mph (136.79 km/h) | 88.98 mph (143.19 km/h) |
| 90 mph (144.84 km/h) | 94.21 mph (151.62 km/h) |
| 95 mph (152.89 km/h) | 99.44 mph (160.04 km/h) |
| 100 mph (160.93 km/h) | 104.68 mph (168.46 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
