Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 28.37 (720.7) | 0.67 (17) 2.4% |
| Width inches (mm) | 5.71 (145) | 6.1 (155) | 0.39 (10) 6.9% |
| Circum. inches (mm) | 87.04 (2210.74) | 89.14 (2264.15) | 2.1 (53.41) 2.4% |
| 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) | 710.8 (441.67) | -17.17 (-10.67) -2.4% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.48 mph (32.96 km/h) |
| 25 mph (40.23 km/h) | 25.6 mph (41.21 km/h) |
| 30 mph (48.28 km/h) | 30.72 mph (49.45 km/h) |
| 35 mph (56.33 km/h) | 35.85 mph (57.69 km/h) |
| 40 mph (64.37 km/h) | 40.97 mph (65.93 km/h) |
| 45 mph (72.42 km/h) | 46.09 mph (74.17 km/h) |
| 50 mph (80.47 km/h) | 51.21 mph (82.41 km/h) |
| 55 mph (88.51 km/h) | 56.33 mph (90.65 km/h) |
| 60 mph (96.56 km/h) | 61.45 mph (98.89 km/h) |
| 65 mph (104.61 km/h) | 66.57 mph (107.13 km/h) |
| 70 mph (112.65 km/h) | 71.69 mph (115.38 km/h) |
| 75 mph (120.7 km/h) | 76.81 mph (123.62 km/h) |
| 80 mph (128.75 km/h) | 81.93 mph (131.86 km/h) |
| 85 mph (136.79 km/h) | 87.05 mph (140.1 km/h) |
| 90 mph (144.84 km/h) | 92.17 mph (148.34 km/h) |
| 95 mph (152.89 km/h) | 97.3 mph (156.58 km/h) |
| 100 mph (160.93 km/h) | 102.42 mph (164.82 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1809 | 2101 | 2263 | 2363 | 2471 | 2548 | 2632 | 2733 | 2871 | 3010 | 3164 | 3287 | 3510 | 3756 | 3949 | 4072 | 4141 | 4395 | 4749 | 5519 |
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