Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 27.7 (703.7) | -2.7 (-68.5) -8.9% |
| Width inches (mm) | 6.89 (175) | 5.71 (145) | -1.18 (-30) -17.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 87.04 (2210.74) | -8.47 (-215.2) -8.9% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 4.85 (123.25) | -1.35 (-34.25) -21.7% |
| Revolutions per mile (km) | 663.39 (412.21) | 727.97 (452.34) | 64.58 (40.13) 9.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.23 mph (29.33 km/h) |
| 25 mph (40.23 km/h) | 22.78 mph (36.66 km/h) |
| 30 mph (48.28 km/h) | 27.34 mph (44 km/h) |
| 35 mph (56.33 km/h) | 31.9 mph (51.33 km/h) |
| 40 mph (64.37 km/h) | 36.45 mph (58.66 km/h) |
| 45 mph (72.42 km/h) | 41.01 mph (66 km/h) |
| 50 mph (80.47 km/h) | 45.56 mph (73.33 km/h) |
| 55 mph (88.51 km/h) | 50.12 mph (80.66 km/h) |
| 60 mph (96.56 km/h) | 54.68 mph (88 km/h) |
| 65 mph (104.61 km/h) | 59.23 mph (95.33 km/h) |
| 70 mph (112.65 km/h) | 63.79 mph (102.66 km/h) |
| 75 mph (120.7 km/h) | 68.35 mph (109.99 km/h) |
| 80 mph (128.75 km/h) | 72.9 mph (117.33 km/h) |
| 85 mph (136.79 km/h) | 77.46 mph (124.66 km/h) |
| 90 mph (144.84 km/h) | 82.02 mph (131.99 km/h) |
| 95 mph (152.89 km/h) | 86.57 mph (139.33 km/h) |
| 100 mph (160.93 km/h) | 91.13 mph (146.66 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1853 | 2152 | 2318 | 2420 | 2530 | 2609 | 2696 | 2799 | 2940 | 3082 | 3240 | 3366 | 3595 | 3847 | 4044 | 4170 | 4241 | 4501 | 4864 | 5652 |
Better Fuel Economy Factory Ratios Increased Power
