Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 155/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 28.98 (736.2) | 0.61 (15.5) 2.2% |
| Width inches (mm) | 6.1 (155) | 6.1 (155) | 0 (0) 0% |
| Circum. inches (mm) | 89.14 (2264.15) | 91.06 (2312.84) | 1.92 (48.69) 2.2% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 5.49 (139.5) | 0.31 (7.75) 5.9% |
| Revolutions per mile (km) | 710.8 (441.67) | 695.83 (432.37) | -14.97 (-9.3) -2.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.43 mph (32.88 km/h) |
| 25 mph (40.23 km/h) | 25.54 mph (41.1 km/h) |
| 30 mph (48.28 km/h) | 30.65 mph (49.32 km/h) |
| 35 mph (56.33 km/h) | 35.75 mph (57.54 km/h) |
| 40 mph (64.37 km/h) | 40.86 mph (65.76 km/h) |
| 45 mph (72.42 km/h) | 45.97 mph (73.98 km/h) |
| 50 mph (80.47 km/h) | 51.08 mph (82.2 km/h) |
| 55 mph (88.51 km/h) | 56.18 mph (90.42 km/h) |
| 60 mph (96.56 km/h) | 61.29 mph (98.64 km/h) |
| 65 mph (104.61 km/h) | 66.4 mph (106.86 km/h) |
| 70 mph (112.65 km/h) | 71.51 mph (115.08 km/h) |
| 75 mph (120.7 km/h) | 76.61 mph (123.3 km/h) |
| 80 mph (128.75 km/h) | 81.72 mph (131.52 km/h) |
| 85 mph (136.79 km/h) | 86.83 mph (139.74 km/h) |
| 90 mph (144.84 km/h) | 91.94 mph (147.96 km/h) |
| 95 mph (152.89 km/h) | 97.04 mph (156.18 km/h) |
| 100 mph (160.93 km/h) | 102.15 mph (164.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1771 | 2057 | 2215 | 2313 | 2419 | 2494 | 2577 | 2675 | 2811 | 2946 | 3097 | 3217 | 3436 | 3677 | 3866 | 3986 | 4054 | 4303 | 4649 | 5403 |
Better Fuel Economy Factory Ratios Increased Power
