Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/40-21 | 285/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.35 (745.4) | 29.98 (761.4) | 0.63 (16) 2.1% |
| Width inches (mm) | 10.43 (265) | 11.22 (285) | 0.79 (20) 7.5% |
| Circum. inches (mm) | 92.19 (2341.74) | 94.17 (2392.01) | 1.98 (50.27) 2.1% |
| Sidewall Height inches (mm) | 4.17 (106) | 4.49 (114) | 0.31 (8) 7.5% |
| Revolutions per mile (km) | 687.24 (427.03) | 672.8 (418.06) | -14.44 (-8.97) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.88 km/h) |
| 25 mph (40.23 km/h) | 25.54 mph (41.1 km/h) |
| 30 mph (48.28 km/h) | 30.64 mph (49.32 km/h) |
| 35 mph (56.33 km/h) | 35.75 mph (57.54 km/h) |
| 40 mph (64.37 km/h) | 40.86 mph (65.76 km/h) |
| 45 mph (72.42 km/h) | 45.97 mph (73.98 km/h) |
| 50 mph (80.47 km/h) | 51.07 mph (82.19 km/h) |
| 55 mph (88.51 km/h) | 56.18 mph (90.41 km/h) |
| 60 mph (96.56 km/h) | 61.29 mph (98.63 km/h) |
| 65 mph (104.61 km/h) | 66.4 mph (106.85 km/h) |
| 70 mph (112.65 km/h) | 71.5 mph (115.07 km/h) |
| 75 mph (120.7 km/h) | 76.61 mph (123.29 km/h) |
| 80 mph (128.75 km/h) | 81.72 mph (131.51 km/h) |
| 85 mph (136.79 km/h) | 86.82 mph (139.73 km/h) |
| 90 mph (144.84 km/h) | 91.93 mph (147.95 km/h) |
| 95 mph (152.89 km/h) | 97.04 mph (156.17 km/h) |
| 100 mph (160.93 km/h) | 102.15 mph (164.39 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
