Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-21 | 285/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.68 (753.9) | 30.1 (764.5) | 0.42 (10.6) 1.4% |
| Width inches (mm) | 12.4 (315) | 11.22 (285) | -1.18 (-30) -9.5% |
| Circum. inches (mm) | 93.25 (2368.45) | 94.56 (2401.75) | 1.31 (33.3) 1.4% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 5.05 (128.25) | 0.71 (18) 16.3% |
| Revolutions per mile (km) | 679.49 (422.22) | 670.07 (416.36) | -9.42 (-5.85) -1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.28 mph (32.64 km/h) |
| 25 mph (40.23 km/h) | 25.35 mph (40.8 km/h) |
| 30 mph (48.28 km/h) | 30.42 mph (48.96 km/h) |
| 35 mph (56.33 km/h) | 35.49 mph (57.12 km/h) |
| 40 mph (64.37 km/h) | 40.56 mph (65.28 km/h) |
| 45 mph (72.42 km/h) | 45.63 mph (73.44 km/h) |
| 50 mph (80.47 km/h) | 50.7 mph (81.6 km/h) |
| 55 mph (88.51 km/h) | 55.77 mph (89.76 km/h) |
| 60 mph (96.56 km/h) | 60.84 mph (97.92 km/h) |
| 65 mph (104.61 km/h) | 65.91 mph (106.08 km/h) |
| 70 mph (112.65 km/h) | 70.98 mph (114.24 km/h) |
| 75 mph (120.7 km/h) | 76.05 mph (122.4 km/h) |
| 80 mph (128.75 km/h) | 81.12 mph (130.56 km/h) |
| 85 mph (136.79 km/h) | 86.2 mph (138.72 km/h) |
| 90 mph (144.84 km/h) | 91.27 mph (146.88 km/h) |
| 95 mph (152.89 km/h) | 96.34 mph (155.04 km/h) |
| 100 mph (160.93 km/h) | 101.41 mph (163.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1705 | 1981 | 2133 | 2228 | 2329 | 2402 | 2482 | 2576 | 2707 | 2837 | 2982 | 3098 | 3309 | 3541 | 3722 | 3839 | 3904 | 4143 | 4477 | 5203 |
Better Fuel Economy Factory Ratios Increased Power
