Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 29.35 (745.4) | 0.63 (16) 2.2% |
| Width inches (mm) | 9.65 (245) | 10.43 (265) | 0.79 (20) 8.2% |
| Circum. inches (mm) | 90.22 (2291.48) | 92.19 (2341.74) | 1.98 (50.27) 2.2% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.17 (106) | 0.31 (8) 8.2% |
| Revolutions per mile (km) | 702.32 (436.4) | 687.24 (427.03) | -15.08 (-9.37) -2.1% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.44 mph (32.89 km/h) |
| 25 mph (40.23 km/h) | 25.55 mph (41.12 km/h) |
| 30 mph (48.28 km/h) | 30.66 mph (49.34 km/h) |
| 35 mph (56.33 km/h) | 35.77 mph (57.56 km/h) |
| 40 mph (64.37 km/h) | 40.88 mph (65.79 km/h) |
| 45 mph (72.42 km/h) | 45.99 mph (74.01 km/h) |
| 50 mph (80.47 km/h) | 51.1 mph (82.23 km/h) |
| 55 mph (88.51 km/h) | 56.21 mph (90.46 km/h) |
| 60 mph (96.56 km/h) | 61.32 mph (98.68 km/h) |
| 65 mph (104.61 km/h) | 66.43 mph (106.9 km/h) |
| 70 mph (112.65 km/h) | 71.54 mph (115.13 km/h) |
| 75 mph (120.7 km/h) | 76.65 mph (123.35 km/h) |
| 80 mph (128.75 km/h) | 81.75 mph (131.57 km/h) |
| 85 mph (136.79 km/h) | 86.86 mph (139.8 km/h) |
| 90 mph (144.84 km/h) | 91.97 mph (148.02 km/h) |
| 95 mph (152.89 km/h) | 97.08 mph (156.24 km/h) |
| 100 mph (160.93 km/h) | 102.19 mph (164.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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
