Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 265/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 30.39 (771.9) | -0.65 (-16.5) -2.1% |
| Width inches (mm) | 10.04 (255) | 10.43 (265) | 0.39 (10) 3.9% |
| Circum. inches (mm) | 97.51 (2476.83) | 95.47 (2425) | -2.04 (-51.84) -2.1% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.69 (119.25) | -0.32 (-8.25) -6.5% |
| Revolutions per mile (km) | 649.76 (403.74) | 663.65 (412.37) | 13.89 (8.63) 2.1% |
265/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.27 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.15 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.03 km/h) |
| 45 mph (72.42 km/h) | 44.06 mph (70.9 km/h) |
| 50 mph (80.47 km/h) | 48.95 mph (78.78 km/h) |
| 55 mph (88.51 km/h) | 53.85 mph (86.66 km/h) |
| 60 mph (96.56 km/h) | 58.74 mph (94.54 km/h) |
| 65 mph (104.61 km/h) | 63.64 mph (102.42 km/h) |
| 70 mph (112.65 km/h) | 68.54 mph (110.3 km/h) |
| 75 mph (120.7 km/h) | 73.43 mph (118.17 km/h) |
| 80 mph (128.75 km/h) | 78.33 mph (126.05 km/h) |
| 85 mph (136.79 km/h) | 83.22 mph (133.93 km/h) |
| 90 mph (144.84 km/h) | 88.12 mph (141.81 km/h) |
| 95 mph (152.89 km/h) | 93.01 mph (149.69 km/h) |
| 100 mph (160.93 km/h) | 97.91 mph (157.57 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
