Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/45-21 | 285/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.39 (771.9) | 29.98 (761.4) | -0.41 (-10.5) -1.4% |
| Width inches (mm) | 10.43 (265) | 11.22 (285) | 0.79 (20) 7.5% |
| Circum. inches (mm) | 95.47 (2425) | 94.17 (2392.01) | -1.3 (-32.99) -1.4% |
| Sidewall Height inches (mm) | 4.69 (119.25) | 4.49 (114) | -0.21 (-5.25) -4.4% |
| Revolutions per mile (km) | 663.65 (412.37) | 672.8 (418.06) | 9.15 (5.69) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.73 mph (31.75 km/h) |
| 25 mph (40.23 km/h) | 24.66 mph (39.69 km/h) |
| 30 mph (48.28 km/h) | 29.59 mph (47.62 km/h) |
| 35 mph (56.33 km/h) | 34.52 mph (55.56 km/h) |
| 40 mph (64.37 km/h) | 39.46 mph (63.5 km/h) |
| 45 mph (72.42 km/h) | 44.39 mph (71.44 km/h) |
| 50 mph (80.47 km/h) | 49.32 mph (79.37 km/h) |
| 55 mph (88.51 km/h) | 54.25 mph (87.31 km/h) |
| 60 mph (96.56 km/h) | 59.18 mph (95.25 km/h) |
| 65 mph (104.61 km/h) | 64.12 mph (103.18 km/h) |
| 70 mph (112.65 km/h) | 69.05 mph (111.12 km/h) |
| 75 mph (120.7 km/h) | 73.98 mph (119.06 km/h) |
| 80 mph (128.75 km/h) | 78.91 mph (127 km/h) |
| 85 mph (136.79 km/h) | 83.84 mph (134.93 km/h) |
| 90 mph (144.84 km/h) | 88.78 mph (142.87 km/h) |
| 95 mph (152.89 km/h) | 93.71 mph (150.81 km/h) |
| 100 mph (160.93 km/h) | 98.64 mph (158.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1712 | 1989 | 2142 | 2237 | 2339 | 2412 | 2492 | 2586 | 2718 | 2849 | 2994 | 3111 | 3322 | 3555 | 3738 | 3854 | 3920 | 4160 | 4495 | 5224 |
Better Fuel Economy Factory Ratios Increased Power
