Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 155/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 28.37 (720.7) | -0.61 (-15.5) -2.1% |
| Width inches (mm) | 6.1 (155) | 6.1 (155) | 0 (0) 0% |
| Circum. inches (mm) | 91.06 (2312.84) | 89.14 (2264.15) | -1.92 (-48.69) -2.1% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 5.19 (131.75) | -0.31 (-7.75) -5.6% |
| Revolutions per mile (km) | 695.83 (432.37) | 710.8 (441.67) | 14.97 (9.3) 2.2% |
155/85-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.47 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.26 km/h) |
| 35 mph (56.33 km/h) | 34.26 mph (55.14 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.02 km/h) |
| 45 mph (72.42 km/h) | 44.05 mph (70.9 km/h) |
| 50 mph (80.47 km/h) | 48.95 mph (78.77 km/h) |
| 55 mph (88.51 km/h) | 53.84 mph (86.65 km/h) |
| 60 mph (96.56 km/h) | 58.74 mph (94.53 km/h) |
| 65 mph (104.61 km/h) | 63.63 mph (102.41 km/h) |
| 70 mph (112.65 km/h) | 68.53 mph (110.28 km/h) |
| 75 mph (120.7 km/h) | 73.42 mph (118.16 km/h) |
| 80 mph (128.75 km/h) | 78.32 mph (126.04 km/h) |
| 85 mph (136.79 km/h) | 83.21 mph (133.91 km/h) |
| 90 mph (144.84 km/h) | 88.11 mph (141.79 km/h) |
| 95 mph (152.89 km/h) | 93 mph (149.67 km/h) |
| 100 mph (160.93 km/h) | 97.89 mph (157.55 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
