Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 29.35 (745.4) | 2.09 (53) 7.7% |
| Width inches (mm) | 10.43 (265) | 10.43 (265) | 0 (0) 0% |
| Circum. inches (mm) | 85.64 (2175.24) | 92.19 (2341.74) | 6.56 (166.5) 7.7% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 4.17 (106) | 1.04 (26.5) 33.3% |
| Revolutions per mile (km) | 739.85 (459.72) | 687.24 (427.03) | -52.61 (-32.69) -7.1% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.53 mph (34.65 km/h) |
| 25 mph (40.23 km/h) | 26.91 mph (43.31 km/h) |
| 30 mph (48.28 km/h) | 32.3 mph (51.98 km/h) |
| 35 mph (56.33 km/h) | 37.68 mph (60.64 km/h) |
| 40 mph (64.37 km/h) | 43.06 mph (69.3 km/h) |
| 45 mph (72.42 km/h) | 48.44 mph (77.96 km/h) |
| 50 mph (80.47 km/h) | 53.83 mph (86.63 km/h) |
| 55 mph (88.51 km/h) | 59.21 mph (95.29 km/h) |
| 60 mph (96.56 km/h) | 64.59 mph (103.95 km/h) |
| 65 mph (104.61 km/h) | 69.98 mph (112.61 km/h) |
| 70 mph (112.65 km/h) | 75.36 mph (121.28 km/h) |
| 75 mph (120.7 km/h) | 80.74 mph (129.94 km/h) |
| 80 mph (128.75 km/h) | 86.12 mph (138.6 km/h) |
| 85 mph (136.79 km/h) | 91.51 mph (147.27 km/h) |
| 90 mph (144.84 km/h) | 96.89 mph (155.93 km/h) |
| 95 mph (152.89 km/h) | 102.27 mph (164.59 km/h) |
| 100 mph (160.93 km/h) | 107.65 mph (173.25 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1749 | 2032 | 2188 | 2285 | 2389 | 2463 | 2545 | 2642 | 2776 | 2910 | 3059 | 3178 | 3394 | 3632 | 3818 | 3937 | 4004 | 4249 | 4592 | 5336 |
Better Fuel Economy Factory Ratios Increased Power
