Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 140/60-18 | 155/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.61 (625.2) | 25.93 (658.7) | 1.32 (33.5) 5.4% |
| Width inches (mm) | 5.51 (140) | 6.1 (155) | 0.59 (15) 10.7% |
| Circum. inches (mm) | 77.33 (1964.12) | 81.47 (2069.37) | 4.14 (105.24) 5.4% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.97 (100.75) | 0.66 (16.75) 19.9% |
| Revolutions per mile (km) | 819.37 (509.13) | 777.7 (483.24) | -41.67 (-25.89) -5.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.07 mph (33.91 km/h) |
| 25 mph (40.23 km/h) | 26.34 mph (42.39 km/h) |
| 30 mph (48.28 km/h) | 31.61 mph (50.87 km/h) |
| 35 mph (56.33 km/h) | 36.88 mph (59.35 km/h) |
| 40 mph (64.37 km/h) | 42.14 mph (67.82 km/h) |
| 45 mph (72.42 km/h) | 47.41 mph (76.3 km/h) |
| 50 mph (80.47 km/h) | 52.68 mph (84.78 km/h) |
| 55 mph (88.51 km/h) | 57.95 mph (93.26 km/h) |
| 60 mph (96.56 km/h) | 63.21 mph (101.73 km/h) |
| 65 mph (104.61 km/h) | 68.48 mph (110.21 km/h) |
| 70 mph (112.65 km/h) | 73.75 mph (118.69 km/h) |
| 75 mph (120.7 km/h) | 79.02 mph (127.17 km/h) |
| 80 mph (128.75 km/h) | 84.29 mph (135.65 km/h) |
| 85 mph (136.79 km/h) | 89.55 mph (144.12 km/h) |
| 90 mph (144.84 km/h) | 94.82 mph (152.6 km/h) |
| 95 mph (152.89 km/h) | 100.09 mph (161.08 km/h) |
| 100 mph (160.93 km/h) | 105.36 mph (169.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1979 | 2299 | 2476 | 2585 | 2703 | 2788 | 2880 | 2990 | 3141 | 3293 | 3461 | 3596 | 3840 | 4110 | 4320 | 4455 | 4531 | 4809 | 5196 | 6038 |
Better Fuel Economy Factory Ratios Increased Power
