Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-21 | 265/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.98 (761.4) | 29.35 (745.4) | -0.63 (-16) -2.1% |
| Width inches (mm) | 11.22 (285) | 10.43 (265) | -0.79 (-20) -7% |
| Circum. inches (mm) | 94.17 (2392.01) | 92.19 (2341.74) | -1.98 (-50.27) -2.1% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.17 (106) | -0.31 (-8) -7% |
| Revolutions per mile (km) | 672.8 (418.06) | 687.24 (427.03) | 14.44 (8.97) 2.1% |
265/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.47 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.27 km/h) |
| 35 mph (56.33 km/h) | 34.26 mph (55.14 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.02 km/h) |
| 45 mph (72.42 km/h) | 44.05 mph (70.9 km/h) |
| 50 mph (80.47 km/h) | 48.95 mph (78.78 km/h) |
| 55 mph (88.51 km/h) | 53.84 mph (86.65 km/h) |
| 60 mph (96.56 km/h) | 58.74 mph (94.53 km/h) |
| 65 mph (104.61 km/h) | 63.63 mph (102.41 km/h) |
| 70 mph (112.65 km/h) | 68.53 mph (110.29 km/h) |
| 75 mph (120.7 km/h) | 73.42 mph (118.16 km/h) |
| 80 mph (128.75 km/h) | 78.32 mph (126.04 km/h) |
| 85 mph (136.79 km/h) | 83.21 mph (133.92 km/h) |
| 90 mph (144.84 km/h) | 88.11 mph (141.8 km/h) |
| 95 mph (152.89 km/h) | 93 mph (149.68 km/h) |
| 100 mph (160.93 km/h) | 97.9 mph (157.55 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
