Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-21 | 285/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.85 (732.9) | 29.98 (761.4) | 1.12 (28.5) 3.9% |
| Width inches (mm) | 11.22 (285) | 11.22 (285) | 0 (0) 0% |
| Circum. inches (mm) | 90.65 (2302.47) | 94.17 (2392.01) | 3.53 (89.54) 3.9% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 4.49 (114) | 0.56 (14.25) 14.3% |
| Revolutions per mile (km) | 698.96 (434.31) | 672.8 (418.06) | -26.16 (-16.26) -3.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.78 mph (33.44 km/h) |
| 25 mph (40.23 km/h) | 25.97 mph (41.8 km/h) |
| 30 mph (48.28 km/h) | 31.17 mph (50.16 km/h) |
| 35 mph (56.33 km/h) | 36.36 mph (58.52 km/h) |
| 40 mph (64.37 km/h) | 41.56 mph (66.88 km/h) |
| 45 mph (72.42 km/h) | 46.75 mph (75.24 km/h) |
| 50 mph (80.47 km/h) | 51.94 mph (83.6 km/h) |
| 55 mph (88.51 km/h) | 57.14 mph (91.96 km/h) |
| 60 mph (96.56 km/h) | 62.33 mph (100.32 km/h) |
| 65 mph (104.61 km/h) | 67.53 mph (108.68 km/h) |
| 70 mph (112.65 km/h) | 72.72 mph (117.04 km/h) |
| 75 mph (120.7 km/h) | 77.92 mph (125.39 km/h) |
| 80 mph (128.75 km/h) | 83.11 mph (133.75 km/h) |
| 85 mph (136.79 km/h) | 88.31 mph (142.11 km/h) |
| 90 mph (144.84 km/h) | 93.5 mph (150.47 km/h) |
| 95 mph (152.89 km/h) | 98.69 mph (158.83 km/h) |
| 100 mph (160.93 km/h) | 103.89 mph (167.19 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
