Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 35.35 (898) | 32.34 (821.5) | -3.01 (-76.5) -8.5% |
| Width inches (mm) | 12.8 (325) | 11.22 (285) | -1.57 (-40) -12.3% |
| Circum. inches (mm) | 111.07 (2821.15) | 101.61 (2580.82) | -9.46 (-240.33) -8.5% |
| Sidewall Height inches (mm) | 7.68 (195) | 6.17 (156.75) | -1.51 (-38.25) -19.6% |
| Revolutions per mile (km) | 570.46 (354.46) | 623.58 (387.47) | 53.12 (33.01) 9.3% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.3 mph (29.44 km/h) |
| 25 mph (40.23 km/h) | 22.87 mph (36.81 km/h) |
| 30 mph (48.28 km/h) | 27.44 mph (44.17 km/h) |
| 35 mph (56.33 km/h) | 32.02 mph (51.53 km/h) |
| 40 mph (64.37 km/h) | 36.59 mph (58.89 km/h) |
| 45 mph (72.42 km/h) | 41.17 mph (66.25 km/h) |
| 50 mph (80.47 km/h) | 45.74 mph (73.61 km/h) |
| 55 mph (88.51 km/h) | 50.31 mph (80.97 km/h) |
| 60 mph (96.56 km/h) | 54.89 mph (88.33 km/h) |
| 65 mph (104.61 km/h) | 59.46 mph (95.7 km/h) |
| 70 mph (112.65 km/h) | 64.04 mph (103.06 km/h) |
| 75 mph (120.7 km/h) | 68.61 mph (110.42 km/h) |
| 80 mph (128.75 km/h) | 73.18 mph (117.78 km/h) |
| 85 mph (136.79 km/h) | 77.76 mph (125.14 km/h) |
| 90 mph (144.84 km/h) | 82.33 mph (132.5 km/h) |
| 95 mph (152.89 km/h) | 86.91 mph (139.86 km/h) |
| 100 mph (160.93 km/h) | 91.48 mph (147.22 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1587 | 1843 | 1985 | 2073 | 2168 | 2235 | 2309 | 2397 | 2519 | 2640 | 2775 | 2883 | 3079 | 3295 | 3464 | 3572 | 3633 | 3856 | 4166 | 4842 |
Better Fuel Economy Factory Ratios Increased Power
