Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/40-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.35 (745.4) | 28.85 (732.9) | -0.49 (-12.5) -1.7% |
| Width inches (mm) | 10.43 (265) | 11.22 (285) | 0.79 (20) 7.5% |
| Circum. inches (mm) | 92.19 (2341.74) | 90.65 (2302.47) | -1.55 (-39.27) -1.7% |
| Sidewall Height inches (mm) | 4.17 (106) | 3.93 (99.75) | -0.25 (-6.25) -5.9% |
| Revolutions per mile (km) | 687.24 (427.03) | 698.96 (434.31) | 11.72 (7.28) 1.7% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.66 mph (31.65 km/h) |
| 25 mph (40.23 km/h) | 24.58 mph (39.56 km/h) |
| 30 mph (48.28 km/h) | 29.5 mph (47.47 km/h) |
| 35 mph (56.33 km/h) | 34.41 mph (55.38 km/h) |
| 40 mph (64.37 km/h) | 39.33 mph (63.29 km/h) |
| 45 mph (72.42 km/h) | 44.25 mph (71.21 km/h) |
| 50 mph (80.47 km/h) | 49.16 mph (79.12 km/h) |
| 55 mph (88.51 km/h) | 54.08 mph (87.03 km/h) |
| 60 mph (96.56 km/h) | 58.99 mph (94.94 km/h) |
| 65 mph (104.61 km/h) | 63.91 mph (102.85 km/h) |
| 70 mph (112.65 km/h) | 68.83 mph (110.77 km/h) |
| 75 mph (120.7 km/h) | 73.74 mph (118.68 km/h) |
| 80 mph (128.75 km/h) | 78.66 mph (126.59 km/h) |
| 85 mph (136.79 km/h) | 83.57 mph (134.5 km/h) |
| 90 mph (144.84 km/h) | 88.49 mph (142.41 km/h) |
| 95 mph (152.89 km/h) | 93.41 mph (150.32 km/h) |
| 100 mph (160.93 km/h) | 98.32 mph (158.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1779 | 2066 | 2225 | 2324 | 2430 | 2505 | 2589 | 2687 | 2823 | 2960 | 3111 | 3232 | 3451 | 3694 | 3883 | 4004 | 4072 | 4322 | 4670 | 5427 |
Better Fuel Economy Factory Ratios Increased Power
