Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/40-21 | 305/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.35 (745.4) | 29.41 (746.9) | 0.06 (1.5) 0.2% |
| Width inches (mm) | 10.43 (265) | 12.01 (305) | 1.57 (40) 15.1% |
| Circum. inches (mm) | 92.19 (2341.74) | 92.38 (2346.46) | 0.19 (4.71) 0.2% |
| Sidewall Height inches (mm) | 4.17 (106) | 4.2 (106.75) | 0.03 (0.75) 0.7% |
| Revolutions per mile (km) | 687.24 (427.03) | 685.86 (426.17) | -1.38 (-0.86) -0.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.04 mph (32.25 km/h) |
| 25 mph (40.23 km/h) | 25.05 mph (40.31 km/h) |
| 30 mph (48.28 km/h) | 30.06 mph (48.38 km/h) |
| 35 mph (56.33 km/h) | 35.07 mph (56.44 km/h) |
| 40 mph (64.37 km/h) | 40.08 mph (64.5 km/h) |
| 45 mph (72.42 km/h) | 45.09 mph (72.57 km/h) |
| 50 mph (80.47 km/h) | 50.1 mph (80.63 km/h) |
| 55 mph (88.51 km/h) | 55.11 mph (88.69 km/h) |
| 60 mph (96.56 km/h) | 60.12 mph (96.76 km/h) |
| 65 mph (104.61 km/h) | 65.13 mph (104.82 km/h) |
| 70 mph (112.65 km/h) | 70.14 mph (112.88 km/h) |
| 75 mph (120.7 km/h) | 75.15 mph (120.94 km/h) |
| 80 mph (128.75 km/h) | 80.16 mph (129.01 km/h) |
| 85 mph (136.79 km/h) | 85.17 mph (137.07 km/h) |
| 90 mph (144.84 km/h) | 90.18 mph (145.13 km/h) |
| 95 mph (152.89 km/h) | 95.19 mph (153.2 km/h) |
| 100 mph (160.93 km/h) | 100.2 mph (161.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1745 | 2028 | 2184 | 2280 | 2384 | 2458 | 2540 | 2637 | 2770 | 2904 | 3053 | 3171 | 3387 | 3624 | 3810 | 3929 | 3996 | 4241 | 4583 | 5325 |
Better Fuel Economy Factory Ratios Increased Power
