Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 29.35 (745.4) | -0.31 (-8) -1.1% |
| Width inches (mm) | 10.83 (275) | 10.43 (265) | -0.39 (-10) -3.6% |
| Circum. inches (mm) | 93.18 (2366.88) | 92.19 (2341.74) | -0.99 (-25.13) -1.1% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.17 (106) | -0.16 (-4) -3.6% |
| Revolutions per mile (km) | 679.94 (422.5) | 687.24 (427.03) | 7.3 (4.53) 1.1% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.79 mph (31.85 km/h) |
| 25 mph (40.23 km/h) | 24.73 mph (39.81 km/h) |
| 30 mph (48.28 km/h) | 29.68 mph (47.77 km/h) |
| 35 mph (56.33 km/h) | 34.63 mph (55.73 km/h) |
| 40 mph (64.37 km/h) | 39.58 mph (63.69 km/h) |
| 45 mph (72.42 km/h) | 44.52 mph (71.65 km/h) |
| 50 mph (80.47 km/h) | 49.47 mph (79.61 km/h) |
| 55 mph (88.51 km/h) | 54.42 mph (87.57 km/h) |
| 60 mph (96.56 km/h) | 59.36 mph (95.54 km/h) |
| 65 mph (104.61 km/h) | 64.31 mph (103.5 km/h) |
| 70 mph (112.65 km/h) | 69.26 mph (111.46 km/h) |
| 75 mph (120.7 km/h) | 74.2 mph (119.42 km/h) |
| 80 mph (128.75 km/h) | 79.15 mph (127.38 km/h) |
| 85 mph (136.79 km/h) | 84.1 mph (135.34 km/h) |
| 90 mph (144.84 km/h) | 89.04 mph (143.3 km/h) |
| 95 mph (152.89 km/h) | 93.99 mph (151.26 km/h) |
| 100 mph (160.93 km/h) | 98.94 mph (159.23 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
