Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/60-18 | 180/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.61 (625.2) | 28.5 (724) | 3.89 (98.8) 15.8% |
| Width inches (mm) | 5.51 (140) | 7.09 (180) | 1.57 (40) 28.6% |
| Circum. inches (mm) | 77.33 (1964.12) | 89.55 (2274.51) | 12.22 (310.39) 15.8% |
| Sidewall Height inches (mm) | 3.31 (84) | 4.25 (108) | 0.94 (24) 28.6% |
| Revolutions per mile (km) | 819.37 (509.13) | 707.56 (439.65) | -111.81 (-69.48) -13.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.16 mph (37.27 km/h) |
| 25 mph (40.23 km/h) | 28.95 mph (46.59 km/h) |
| 30 mph (48.28 km/h) | 34.74 mph (55.91 km/h) |
| 35 mph (56.33 km/h) | 40.53 mph (65.23 km/h) |
| 40 mph (64.37 km/h) | 46.32 mph (74.55 km/h) |
| 45 mph (72.42 km/h) | 52.11 mph (83.87 km/h) |
| 50 mph (80.47 km/h) | 57.9 mph (93.18 km/h) |
| 55 mph (88.51 km/h) | 63.69 mph (102.5 km/h) |
| 60 mph (96.56 km/h) | 69.48 mph (111.82 km/h) |
| 65 mph (104.61 km/h) | 75.27 mph (121.14 km/h) |
| 70 mph (112.65 km/h) | 81.06 mph (130.46 km/h) |
| 75 mph (120.7 km/h) | 86.85 mph (139.78 km/h) |
| 80 mph (128.75 km/h) | 92.64 mph (149.09 km/h) |
| 85 mph (136.79 km/h) | 98.43 mph (158.41 km/h) |
| 90 mph (144.84 km/h) | 104.22 mph (167.73 km/h) |
| 95 mph (152.89 km/h) | 110.01 mph (177.05 km/h) |
| 100 mph (160.93 km/h) | 115.8 mph (186.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1801 | 2092 | 2253 | 2352 | 2460 | 2536 | 2620 | 2720 | 2858 | 2996 | 3149 | 3272 | 3494 | 3739 | 3931 | 4053 | 4122 | 4375 | 4728 | 5494 |
Better Fuel Economy Factory Ratios Increased Power
