Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/35-21 | 315/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.85 (732.9) | 29.68 (753.9) | 0.83 (21) 2.9% |
| Width inches (mm) | 11.22 (285) | 12.4 (315) | 1.18 (30) 10.5% |
| Circum. inches (mm) | 90.65 (2302.47) | 93.25 (2368.45) | 2.6 (65.97) 2.9% |
| Sidewall Height inches (mm) | 3.93 (99.75) | 4.34 (110.25) | 0.41 (10.5) 10.5% |
| Revolutions per mile (km) | 698.96 (434.31) | 679.49 (422.22) | -19.47 (-12.1) -2.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.57 mph (33.11 km/h) |
| 25 mph (40.23 km/h) | 25.72 mph (41.39 km/h) |
| 30 mph (48.28 km/h) | 30.86 mph (49.66 km/h) |
| 35 mph (56.33 km/h) | 36 mph (57.94 km/h) |
| 40 mph (64.37 km/h) | 41.15 mph (66.22 km/h) |
| 45 mph (72.42 km/h) | 46.29 mph (74.5 km/h) |
| 50 mph (80.47 km/h) | 51.43 mph (82.77 km/h) |
| 55 mph (88.51 km/h) | 56.58 mph (91.05 km/h) |
| 60 mph (96.56 km/h) | 61.72 mph (99.33 km/h) |
| 65 mph (104.61 km/h) | 66.86 mph (107.6 km/h) |
| 70 mph (112.65 km/h) | 72.01 mph (115.88 km/h) |
| 75 mph (120.7 km/h) | 77.15 mph (124.16 km/h) |
| 80 mph (128.75 km/h) | 82.29 mph (132.44 km/h) |
| 85 mph (136.79 km/h) | 87.44 mph (140.71 km/h) |
| 90 mph (144.84 km/h) | 92.58 mph (148.99 km/h) |
| 95 mph (152.89 km/h) | 97.72 mph (157.27 km/h) |
| 100 mph (160.93 km/h) | 102.87 mph (165.55 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1729 | 2009 | 2163 | 2259 | 2362 | 2436 | 2517 | 2612 | 2745 | 2877 | 3024 | 3142 | 3355 | 3591 | 3775 | 3892 | 3959 | 4202 | 4540 | 5276 |
Better Fuel Economy Factory Ratios Increased Power
