Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 145/90-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 27.28 (692.8) | -0.43 (-10.9) -1.5% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 87.04 (2210.74) | 85.69 (2176.5) | -1.35 (-34.24) -1.5% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 5.14 (130.5) | 0.29 (7.25) 5.9% |
| Revolutions per mile (km) | 727.97 (452.34) | 739.42 (459.45) | 11.45 (7.12) 1.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.69 mph (31.69 km/h) |
| 25 mph (40.23 km/h) | 24.61 mph (39.61 km/h) |
| 30 mph (48.28 km/h) | 29.54 mph (47.53 km/h) |
| 35 mph (56.33 km/h) | 34.46 mph (55.45 km/h) |
| 40 mph (64.37 km/h) | 39.38 mph (63.38 km/h) |
| 45 mph (72.42 km/h) | 44.3 mph (71.3 km/h) |
| 50 mph (80.47 km/h) | 49.23 mph (79.22 km/h) |
| 55 mph (88.51 km/h) | 54.15 mph (87.14 km/h) |
| 60 mph (96.56 km/h) | 59.07 mph (95.07 km/h) |
| 65 mph (104.61 km/h) | 63.99 mph (102.99 km/h) |
| 70 mph (112.65 km/h) | 68.92 mph (110.91 km/h) |
| 75 mph (120.7 km/h) | 73.84 mph (118.83 km/h) |
| 80 mph (128.75 km/h) | 78.76 mph (126.75 km/h) |
| 85 mph (136.79 km/h) | 83.68 mph (134.68 km/h) |
| 90 mph (144.84 km/h) | 88.61 mph (142.6 km/h) |
| 95 mph (152.89 km/h) | 93.53 mph (150.52 km/h) |
| 100 mph (160.93 km/h) | 98.45 mph (158.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1882 | 2186 | 2354 | 2458 | 2570 | 2650 | 2738 | 2843 | 2987 | 3131 | 3291 | 3419 | 3651 | 3907 | 4108 | 4236 | 4308 | 4572 | 4940 | 5741 |
Better Fuel Economy Factory Ratios Increased Power
