Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 275/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 30.83 (783) | 0.43 (10.8) 1.4% |
| Width inches (mm) | 6.89 (175) | 10.83 (275) | 3.94 (100) 57.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 96.85 (2459.87) | 1.34 (33.93) 1.4% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.41 (137.5) | -0.79 (-20) -12.7% |
| Revolutions per mile (km) | 663.39 (412.21) | 654.24 (406.53) | -9.15 (-5.69) -1.4% |
275/50-20 Tires
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 (57.11 km/h) |
| 40 mph (64.37 km/h) | 40.56 mph (65.27 km/h) |
| 45 mph (72.42 km/h) | 45.63 mph (73.43 km/h) |
| 50 mph (80.47 km/h) | 50.7 mph (81.59 km/h) |
| 55 mph (88.51 km/h) | 55.77 mph (89.75 km/h) |
| 60 mph (96.56 km/h) | 60.84 mph (97.91 km/h) |
| 65 mph (104.61 km/h) | 65.91 mph (106.07 km/h) |
| 70 mph (112.65 km/h) | 70.98 mph (114.23 km/h) |
| 75 mph (120.7 km/h) | 76.05 mph (122.39 km/h) |
| 80 mph (128.75 km/h) | 81.12 mph (130.55 km/h) |
| 85 mph (136.79 km/h) | 86.19 mph (138.71 km/h) |
| 90 mph (144.84 km/h) | 91.26 mph (146.87 km/h) |
| 95 mph (152.89 km/h) | 96.33 mph (155.03 km/h) |
| 100 mph (160.93 km/h) | 101.4 mph (163.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1665 | 1934 | 2083 | 2175 | 2274 | 2345 | 2423 | 2515 | 2643 | 2770 | 2912 | 3025 | 3231 | 3457 | 3634 | 3748 | 3812 | 4045 | 4371 | 5080 |
Better Fuel Economy Factory Ratios Increased Power
