Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 185/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 27.47 (697.7) | 1.48 (37.5) 5.7% |
| Width inches (mm) | 5.71 (145) | 7.28 (185) | 1.57 (40) 27.6% |
| Circum. inches (mm) | 81.66 (2074.08) | 86.29 (2191.89) | 4.64 (117.81) 5.7% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.73 (120.25) | 0.74 (18.75) 18.5% |
| Revolutions per mile (km) | 775.93 (482.14) | 734.23 (456.23) | -41.7 (-25.91) -5.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.14 mph (34.02 km/h) |
| 25 mph (40.23 km/h) | 26.42 mph (42.52 km/h) |
| 30 mph (48.28 km/h) | 31.7 mph (51.02 km/h) |
| 35 mph (56.33 km/h) | 36.99 mph (59.53 km/h) |
| 40 mph (64.37 km/h) | 42.27 mph (68.03 km/h) |
| 45 mph (72.42 km/h) | 47.56 mph (76.53 km/h) |
| 50 mph (80.47 km/h) | 52.84 mph (85.04 km/h) |
| 55 mph (88.51 km/h) | 58.12 mph (93.54 km/h) |
| 60 mph (96.56 km/h) | 63.41 mph (102.05 km/h) |
| 65 mph (104.61 km/h) | 68.69 mph (110.55 km/h) |
| 70 mph (112.65 km/h) | 73.98 mph (119.05 km/h) |
| 75 mph (120.7 km/h) | 79.26 mph (127.56 km/h) |
| 80 mph (128.75 km/h) | 84.54 mph (136.06 km/h) |
| 85 mph (136.79 km/h) | 89.83 mph (144.56 km/h) |
| 90 mph (144.84 km/h) | 95.11 mph (153.07 km/h) |
| 95 mph (152.89 km/h) | 100.4 mph (161.57 km/h) |
| 100 mph (160.93 km/h) | 105.68 mph (170.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1868 | 2171 | 2338 | 2441 | 2552 | 2632 | 2719 | 2823 | 2966 | 3109 | 3268 | 3395 | 3626 | 3880 | 4079 | 4206 | 4278 | 4540 | 4906 | 5701 |
Better Fuel Economy Factory Ratios Increased Power
