Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/45-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.39 (771.9) | 29.35 (745.4) | -1.04 (-26.5) -3.4% |
| Width inches (mm) | 10.43 (265) | 10.43 (265) | 0 (0) 0% |
| Circum. inches (mm) | 95.47 (2425) | 92.19 (2341.74) | -3.28 (-83.25) -3.4% |
| Sidewall Height inches (mm) | 4.69 (119.25) | 4.17 (106) | -0.52 (-13.25) -11.1% |
| Revolutions per mile (km) | 663.65 (412.37) | 687.24 (427.03) | 23.59 (14.66) 3.6% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.31 mph (31.08 km/h) |
| 25 mph (40.23 km/h) | 24.14 mph (38.85 km/h) |
| 30 mph (48.28 km/h) | 28.97 mph (46.62 km/h) |
| 35 mph (56.33 km/h) | 33.8 mph (54.39 km/h) |
| 40 mph (64.37 km/h) | 38.63 mph (62.16 km/h) |
| 45 mph (72.42 km/h) | 43.46 mph (69.93 km/h) |
| 50 mph (80.47 km/h) | 48.28 mph (77.7 km/h) |
| 55 mph (88.51 km/h) | 53.11 mph (85.48 km/h) |
| 60 mph (96.56 km/h) | 57.94 mph (93.25 km/h) |
| 65 mph (104.61 km/h) | 62.77 mph (101.02 km/h) |
| 70 mph (112.65 km/h) | 67.6 mph (108.79 km/h) |
| 75 mph (120.7 km/h) | 72.43 mph (116.56 km/h) |
| 80 mph (128.75 km/h) | 77.25 mph (124.33 km/h) |
| 85 mph (136.79 km/h) | 82.08 mph (132.1 km/h) |
| 90 mph (144.84 km/h) | 86.91 mph (139.87 km/h) |
| 95 mph (152.89 km/h) | 91.74 mph (147.64 km/h) |
| 100 mph (160.93 km/h) | 96.57 mph (155.41 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
