Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/70-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 28.37 (720.7) | 2.93 (74.5) 11.5% |
| Width inches (mm) | 5.31 (135) | 6.1 (155) | 0.79 (20) 14.8% |
| Circum. inches (mm) | 79.93 (2030.1) | 89.14 (2264.15) | 9.21 (234.05) 11.5% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 5.19 (131.75) | 1.47 (37.25) 39.4% |
| Revolutions per mile (km) | 792.74 (492.59) | 710.8 (441.67) | -81.95 (-50.92) -10.3% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.31 mph (35.9 km/h) |
| 25 mph (40.23 km/h) | 27.88 mph (44.87 km/h) |
| 30 mph (48.28 km/h) | 33.46 mph (53.85 km/h) |
| 35 mph (56.33 km/h) | 39.04 mph (62.82 km/h) |
| 40 mph (64.37 km/h) | 44.61 mph (71.8 km/h) |
| 45 mph (72.42 km/h) | 50.19 mph (80.77 km/h) |
| 50 mph (80.47 km/h) | 55.76 mph (89.74 km/h) |
| 55 mph (88.51 km/h) | 61.34 mph (98.72 km/h) |
| 60 mph (96.56 km/h) | 66.92 mph (107.69 km/h) |
| 65 mph (104.61 km/h) | 72.49 mph (116.67 km/h) |
| 70 mph (112.65 km/h) | 78.07 mph (125.64 km/h) |
| 75 mph (120.7 km/h) | 83.65 mph (134.62 km/h) |
| 80 mph (128.75 km/h) | 89.22 mph (143.59 km/h) |
| 85 mph (136.79 km/h) | 94.8 mph (152.57 km/h) |
| 90 mph (144.84 km/h) | 100.38 mph (161.54 km/h) |
| 95 mph (152.89 km/h) | 105.95 mph (170.51 km/h) |
| 100 mph (160.93 km/h) | 111.53 mph (179.49 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 |
Better Fuel Economy Factory Ratios Increased Power
