Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 155/85-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 27.37 (695.3) | -0.33 (-8.4) -1.2% |
| Width inches (mm) | 5.71 (145) | 6.1 (155) | 0.39 (10) 6.9% |
| Circum. inches (mm) | 87.04 (2210.74) | 86 (2184.35) | -1.04 (-26.39) -1.2% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 5.19 (131.75) | 0.33 (8.5) 6.9% |
| Revolutions per mile (km) | 727.97 (452.34) | 736.76 (457.8) | 8.79 (5.46) 1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.76 mph (31.8 km/h) |
| 25 mph (40.23 km/h) | 24.7 mph (39.75 km/h) |
| 30 mph (48.28 km/h) | 29.64 mph (47.7 km/h) |
| 35 mph (56.33 km/h) | 34.58 mph (55.65 km/h) |
| 40 mph (64.37 km/h) | 39.52 mph (63.61 km/h) |
| 45 mph (72.42 km/h) | 44.46 mph (71.56 km/h) |
| 50 mph (80.47 km/h) | 49.4 mph (79.51 km/h) |
| 55 mph (88.51 km/h) | 54.34 mph (87.46 km/h) |
| 60 mph (96.56 km/h) | 59.28 mph (95.41 km/h) |
| 65 mph (104.61 km/h) | 64.22 mph (103.36 km/h) |
| 70 mph (112.65 km/h) | 69.16 mph (111.31 km/h) |
| 75 mph (120.7 km/h) | 74.1 mph (119.26 km/h) |
| 80 mph (128.75 km/h) | 79.05 mph (127.21 km/h) |
| 85 mph (136.79 km/h) | 83.99 mph (135.16 km/h) |
| 90 mph (144.84 km/h) | 88.93 mph (143.11 km/h) |
| 95 mph (152.89 km/h) | 93.87 mph (151.06 km/h) |
| 100 mph (160.93 km/h) | 98.81 mph (159.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1875 | 2178 | 2346 | 2449 | 2561 | 2641 | 2729 | 2832 | 2976 | 3120 | 3279 | 3407 | 3638 | 3893 | 4093 | 4221 | 4292 | 4556 | 4923 | 5720 |
Better Fuel Economy Factory Ratios Increased Power
