Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/90-18 | 145/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.69 (754.2) | 22.57 (573.2) | -7.13 (-181) -24% |
| Width inches (mm) | 6.5 (165) | 5.71 (145) | -0.79 (-20) -12.1% |
| Circum. inches (mm) | 93.28 (2369.39) | 70.9 (1800.76) | -22.39 (-568.63) -24% |
| Sidewall Height inches (mm) | 5.85 (148.5) | 2.28 (58) | -3.56 (-90.5) -60.9% |
| Revolutions per mile (km) | 679.22 (422.05) | 893.7 (555.32) | 214.48 (133.27) 31.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 15.2 mph (24.46 km/h) |
| 25 mph (40.23 km/h) | 19 mph (30.58 km/h) |
| 30 mph (48.28 km/h) | 22.8 mph (36.69 km/h) |
| 35 mph (56.33 km/h) | 26.6 mph (42.81 km/h) |
| 40 mph (64.37 km/h) | 30.4 mph (48.92 km/h) |
| 45 mph (72.42 km/h) | 34.2 mph (55.04 km/h) |
| 50 mph (80.47 km/h) | 38 mph (61.16 km/h) |
| 55 mph (88.51 km/h) | 41.8 mph (67.27 km/h) |
| 60 mph (96.56 km/h) | 45.6 mph (73.39 km/h) |
| 65 mph (104.61 km/h) | 49.4 mph (79.5 km/h) |
| 70 mph (112.65 km/h) | 53.2 mph (85.62 km/h) |
| 75 mph (120.7 km/h) | 57 mph (91.73 km/h) |
| 80 mph (128.75 km/h) | 60.8 mph (97.85 km/h) |
| 85 mph (136.79 km/h) | 64.6 mph (103.97 km/h) |
| 90 mph (144.84 km/h) | 68.4 mph (110.08 km/h) |
| 95 mph (152.89 km/h) | 72.2 mph (116.2 km/h) |
| 100 mph (160.93 km/h) | 76 mph (122.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2274 | 2642 | 2845 | 2971 | 3107 | 3203 | 3310 | 3436 | 3610 | 3784 | 3978 | 4132 | 4413 | 4723 | 4965 | 5120 | 5207 | 5526 | 5971 | 6939 |
Better Fuel Economy Factory Ratios Increased Power
