Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 285/20-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 24.49 (622) | -0.59 (-15) -2.4% |
| Width inches (mm) | 8.46 (215) | 11.22 (285) | 2.76 (70) 32.6% |
| Circum. inches (mm) | 78.79 (2001.19) | 76.93 (1954.07) | -1.86 (-47.12) -2.4% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 2.24 (57) | -0.3 (-7.5) -11.6% |
| Revolutions per mile (km) | 804.19 (499.7) | 823.59 (511.75) | 19.39 (12.05) 2.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.53 mph (31.43 km/h) |
| 25 mph (40.23 km/h) | 24.41 mph (39.29 km/h) |
| 30 mph (48.28 km/h) | 29.29 mph (47.14 km/h) |
| 35 mph (56.33 km/h) | 34.18 mph (55 km/h) |
| 40 mph (64.37 km/h) | 39.06 mph (62.86 km/h) |
| 45 mph (72.42 km/h) | 43.94 mph (70.72 km/h) |
| 50 mph (80.47 km/h) | 48.82 mph (78.57 km/h) |
| 55 mph (88.51 km/h) | 53.7 mph (86.43 km/h) |
| 60 mph (96.56 km/h) | 58.59 mph (94.29 km/h) |
| 65 mph (104.61 km/h) | 63.47 mph (102.14 km/h) |
| 70 mph (112.65 km/h) | 68.35 mph (110 km/h) |
| 75 mph (120.7 km/h) | 73.23 mph (117.86 km/h) |
| 80 mph (128.75 km/h) | 78.12 mph (125.72 km/h) |
| 85 mph (136.79 km/h) | 83 mph (133.57 km/h) |
| 90 mph (144.84 km/h) | 87.88 mph (141.43 km/h) |
| 95 mph (152.89 km/h) | 92.76 mph (149.29 km/h) |
| 100 mph (160.93 km/h) | 97.65 mph (157.15 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2096 | 2435 | 2622 | 2738 | 2863 | 2952 | 3050 | 3166 | 3327 | 3487 | 3666 | 3808 | 4067 | 4352 | 4575 | 4718 | 4798 | 5093 | 5503 | 6395 |
Better Fuel Economy Factory Ratios Increased Power
