Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 29.35 (745.4) | 0.31 (8) 1.1% |
| Width inches (mm) | 10.04 (255) | 10.43 (265) | 0.39 (10) 3.9% |
| Circum. inches (mm) | 91.21 (2316.61) | 92.19 (2341.74) | 0.99 (25.13) 1.1% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.17 (106) | 0.16 (4) 3.9% |
| Revolutions per mile (km) | 694.7 (431.66) | 687.24 (427.03) | -7.46 (-4.63) -1.1% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.22 mph (32.54 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.67 km/h) |
| 30 mph (48.28 km/h) | 30.33 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.38 mph (56.94 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.07 km/h) |
| 45 mph (72.42 km/h) | 45.49 mph (73.21 km/h) |
| 50 mph (80.47 km/h) | 50.54 mph (81.34 km/h) |
| 55 mph (88.51 km/h) | 55.6 mph (89.47 km/h) |
| 60 mph (96.56 km/h) | 60.65 mph (97.61 km/h) |
| 65 mph (104.61 km/h) | 65.71 mph (105.74 km/h) |
| 70 mph (112.65 km/h) | 70.76 mph (113.88 km/h) |
| 75 mph (120.7 km/h) | 75.81 mph (122.01 km/h) |
| 80 mph (128.75 km/h) | 80.87 mph (130.14 km/h) |
| 85 mph (136.79 km/h) | 85.92 mph (138.28 km/h) |
| 90 mph (144.84 km/h) | 90.98 mph (146.41 km/h) |
| 95 mph (152.89 km/h) | 96.03 mph (154.55 km/h) |
| 100 mph (160.93 km/h) | 101.08 mph (162.68 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
