Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 28.37 (720.7) | 1.83 (46.5) 6.9% |
| Width inches (mm) | 6.1 (155) | 6.1 (155) | 0 (0) 0% |
| Circum. inches (mm) | 83.39 (2118.06) | 89.14 (2264.15) | 5.75 (146.08) 6.9% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 5.19 (131.75) | 0.92 (23.25) 21.4% |
| Revolutions per mile (km) | 759.82 (472.13) | 710.8 (441.67) | -49.02 (-30.46) -6.5% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.38 mph (34.41 km/h) |
| 25 mph (40.23 km/h) | 26.72 mph (43.01 km/h) |
| 30 mph (48.28 km/h) | 32.07 mph (51.61 km/h) |
| 35 mph (56.33 km/h) | 37.41 mph (60.21 km/h) |
| 40 mph (64.37 km/h) | 42.76 mph (68.81 km/h) |
| 45 mph (72.42 km/h) | 48.1 mph (77.42 km/h) |
| 50 mph (80.47 km/h) | 53.45 mph (86.02 km/h) |
| 55 mph (88.51 km/h) | 58.79 mph (94.62 km/h) |
| 60 mph (96.56 km/h) | 64.14 mph (103.22 km/h) |
| 65 mph (104.61 km/h) | 69.48 mph (111.82 km/h) |
| 70 mph (112.65 km/h) | 74.83 mph (120.42 km/h) |
| 75 mph (120.7 km/h) | 80.17 mph (129.03 km/h) |
| 80 mph (128.75 km/h) | 85.52 mph (137.63 km/h) |
| 85 mph (136.79 km/h) | 90.86 mph (146.23 km/h) |
| 90 mph (144.84 km/h) | 96.21 mph (154.83 km/h) |
| 95 mph (152.89 km/h) | 101.55 mph (163.43 km/h) |
| 100 mph (160.93 km/h) | 106.9 mph (172.03 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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