Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/90-17 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.69 (728.8) | 28.37 (720.7) | -0.32 (-8.1) -1.1% |
| Width inches (mm) | 6.5 (165) | 6.1 (155) | -0.39 (-10) -6.1% |
| Circum. inches (mm) | 90.14 (2289.59) | 89.14 (2264.15) | -1 (-25.45) -1.1% |
| Sidewall Height inches (mm) | 5.85 (148.5) | 5.19 (131.75) | -0.66 (-16.75) -11.3% |
| Revolutions per mile (km) | 702.9 (436.76) | 710.8 (441.67) | 7.9 (4.91) 1.1% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.78 mph (31.83 km/h) |
| 25 mph (40.23 km/h) | 24.72 mph (39.79 km/h) |
| 30 mph (48.28 km/h) | 29.67 mph (47.74 km/h) |
| 35 mph (56.33 km/h) | 34.61 mph (55.7 km/h) |
| 40 mph (64.37 km/h) | 39.56 mph (63.66 km/h) |
| 45 mph (72.42 km/h) | 44.5 mph (71.62 km/h) |
| 50 mph (80.47 km/h) | 49.44 mph (79.57 km/h) |
| 55 mph (88.51 km/h) | 54.39 mph (87.53 km/h) |
| 60 mph (96.56 km/h) | 59.33 mph (95.49 km/h) |
| 65 mph (104.61 km/h) | 64.28 mph (103.44 km/h) |
| 70 mph (112.65 km/h) | 69.22 mph (111.4 km/h) |
| 75 mph (120.7 km/h) | 74.17 mph (119.36 km/h) |
| 80 mph (128.75 km/h) | 79.11 mph (127.32 km/h) |
| 85 mph (136.79 km/h) | 84.06 mph (135.27 km/h) |
| 90 mph (144.84 km/h) | 89 mph (143.23 km/h) |
| 95 mph (152.89 km/h) | 93.94 mph (151.19 km/h) |
| 100 mph (160.93 km/h) | 98.89 mph (159.15 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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