Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 28.37 (720.7) | 1.16 (29.5) 4.3% |
| Width inches (mm) | 7.09 (180) | 6.1 (155) | -0.98 (-25) -13.9% |
| Circum. inches (mm) | 85.49 (2171.47) | 89.14 (2264.15) | 3.65 (92.68) 4.3% |
| Sidewall Height inches (mm) | 4.61 (117) | 5.19 (131.75) | 0.58 (14.75) 12.6% |
| Revolutions per mile (km) | 741.13 (460.52) | 710.8 (441.67) | -30.34 (-18.85) -4.1% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.85 mph (33.56 km/h) |
| 25 mph (40.23 km/h) | 26.07 mph (41.95 km/h) |
| 30 mph (48.28 km/h) | 31.28 mph (50.34 km/h) |
| 35 mph (56.33 km/h) | 36.49 mph (58.73 km/h) |
| 40 mph (64.37 km/h) | 41.71 mph (67.12 km/h) |
| 45 mph (72.42 km/h) | 46.92 mph (75.51 km/h) |
| 50 mph (80.47 km/h) | 52.13 mph (83.9 km/h) |
| 55 mph (88.51 km/h) | 57.35 mph (92.29 km/h) |
| 60 mph (96.56 km/h) | 62.56 mph (100.68 km/h) |
| 65 mph (104.61 km/h) | 67.77 mph (109.07 km/h) |
| 70 mph (112.65 km/h) | 72.99 mph (117.46 km/h) |
| 75 mph (120.7 km/h) | 78.2 mph (125.85 km/h) |
| 80 mph (128.75 km/h) | 83.41 mph (134.24 km/h) |
| 85 mph (136.79 km/h) | 88.63 mph (142.63 km/h) |
| 90 mph (144.84 km/h) | 93.84 mph (151.02 km/h) |
| 95 mph (152.89 km/h) | 99.05 mph (159.41 km/h) |
| 100 mph (160.93 km/h) | 104.27 mph (167.8 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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