Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 28.37 (720.7) | 2.68 (68) 10.4% |
| Width inches (mm) | 4.53 (115) | 6.1 (155) | 1.57 (40) 34.8% |
| Circum. inches (mm) | 80.73 (2050.52) | 89.14 (2264.15) | 8.41 (213.63) 10.4% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 5.19 (131.75) | 1.34 (34) 34.8% |
| Revolutions per mile (km) | 784.85 (487.68) | 710.8 (441.67) | -74.05 (-46.01) -9.4% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.08 mph (35.54 km/h) |
| 25 mph (40.23 km/h) | 27.6 mph (44.43 km/h) |
| 30 mph (48.28 km/h) | 33.13 mph (53.31 km/h) |
| 35 mph (56.33 km/h) | 38.65 mph (62.2 km/h) |
| 40 mph (64.37 km/h) | 44.17 mph (71.08 km/h) |
| 45 mph (72.42 km/h) | 49.69 mph (79.97 km/h) |
| 50 mph (80.47 km/h) | 55.21 mph (88.85 km/h) |
| 55 mph (88.51 km/h) | 60.73 mph (97.74 km/h) |
| 60 mph (96.56 km/h) | 66.25 mph (106.62 km/h) |
| 65 mph (104.61 km/h) | 71.77 mph (115.51 km/h) |
| 70 mph (112.65 km/h) | 77.29 mph (124.39 km/h) |
| 75 mph (120.7 km/h) | 82.81 mph (133.28 km/h) |
| 80 mph (128.75 km/h) | 88.33 mph (142.16 km/h) |
| 85 mph (136.79 km/h) | 93.86 mph (151.05 km/h) |
| 90 mph (144.84 km/h) | 99.38 mph (159.93 km/h) |
| 95 mph (152.89 km/h) | 104.9 mph (168.82 km/h) |
| 100 mph (160.93 km/h) | 110.42 mph (177.7 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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