Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-20 | 285/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.72) | 32.34 (821.5) | -0.68 (-17.22) -2.1% |
| Width inches (mm) | 12.52 (318) | 11.22 (285) | -1.3 (-33) -10.4% |
| Circum. inches (mm) | 103.74 (2634.92) | 101.61 (2580.82) | -2.13 (-54.1) -2.1% |
| Sidewall Height inches (mm) | 6.51 (165.36) | 6.17 (156.75) | -0.34 (-8.61) -5.2% |
| Revolutions per mile (km) | 610.78 (379.52) | 623.58 (387.47) | 12.8 (7.96) 2.1% |
285/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.59 mph (31.53 km/h) |
| 25 mph (40.23 km/h) | 24.49 mph (39.41 km/h) |
| 30 mph (48.28 km/h) | 29.38 mph (47.29 km/h) |
| 35 mph (56.33 km/h) | 34.28 mph (55.17 km/h) |
| 40 mph (64.37 km/h) | 39.18 mph (63.05 km/h) |
| 45 mph (72.42 km/h) | 44.08 mph (70.93 km/h) |
| 50 mph (80.47 km/h) | 48.97 mph (78.82 km/h) |
| 55 mph (88.51 km/h) | 53.87 mph (86.7 km/h) |
| 60 mph (96.56 km/h) | 58.77 mph (94.58 km/h) |
| 65 mph (104.61 km/h) | 63.67 mph (102.46 km/h) |
| 70 mph (112.65 km/h) | 68.56 mph (110.34 km/h) |
| 75 mph (120.7 km/h) | 73.46 mph (118.22 km/h) |
| 80 mph (128.75 km/h) | 78.36 mph (126.1 km/h) |
| 85 mph (136.79 km/h) | 83.25 mph (133.99 km/h) |
| 90 mph (144.84 km/h) | 88.15 mph (141.87 km/h) |
| 95 mph (152.89 km/h) | 93.05 mph (149.75 km/h) |
| 100 mph (160.93 km/h) | 97.95 mph (157.63 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
