Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 264/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 29.31 (744.6) | 0.6 (15.2) 2.1% |
| Width inches (mm) | 9.65 (245) | 10.39 (264) | 0.75 (19) 7.8% |
| Circum. inches (mm) | 90.22 (2291.48) | 92.1 (2339.23) | 1.88 (47.75) 2.1% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.16 (105.6) | 0.3 (7.6) 7.8% |
| Revolutions per mile (km) | 702.32 (436.4) | 687.98 (427.49) | -14.34 (-8.91) -2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.07 km/h) |
| 30 mph (48.28 km/h) | 30.63 mph (49.29 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.5 km/h) |
| 40 mph (64.37 km/h) | 40.83 mph (65.72 km/h) |
| 45 mph (72.42 km/h) | 45.94 mph (73.93 km/h) |
| 50 mph (80.47 km/h) | 51.04 mph (82.14 km/h) |
| 55 mph (88.51 km/h) | 56.15 mph (90.36 km/h) |
| 60 mph (96.56 km/h) | 61.25 mph (98.57 km/h) |
| 65 mph (104.61 km/h) | 66.35 mph (106.79 km/h) |
| 70 mph (112.65 km/h) | 71.46 mph (115 km/h) |
| 75 mph (120.7 km/h) | 76.56 mph (123.22 km/h) |
| 80 mph (128.75 km/h) | 81.67 mph (131.43 km/h) |
| 85 mph (136.79 km/h) | 86.77 mph (139.65 km/h) |
| 90 mph (144.84 km/h) | 91.88 mph (147.86 km/h) |
| 95 mph (152.89 km/h) | 96.98 mph (156.07 km/h) |
| 100 mph (160.93 km/h) | 102.08 mph (164.29 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1751 | 2034 | 2190 | 2287 | 2391 | 2466 | 2548 | 2645 | 2779 | 2913 | 3062 | 3181 | 3397 | 3636 | 3822 | 3941 | 4008 | 4254 | 4597 | 5342 |
Better Fuel Economy Factory Ratios Increased Power
