Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 155/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 27.76 (705.2) | -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) | 87.22 (2215.45) | -1.92 (-48.69) -2.2% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.88 (124) | -0.31 (-7.75) -5.9% |
| Revolutions per mile (km) | 710.8 (441.67) | 726.42 (451.37) | 15.62 (9.71) 2.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.57 mph (31.49 km/h) |
| 25 mph (40.23 km/h) | 24.46 mph (39.37 km/h) |
| 30 mph (48.28 km/h) | 29.35 mph (47.24 km/h) |
| 35 mph (56.33 km/h) | 34.25 mph (55.12 km/h) |
| 40 mph (64.37 km/h) | 39.14 mph (62.99 km/h) |
| 45 mph (72.42 km/h) | 44.03 mph (70.86 km/h) |
| 50 mph (80.47 km/h) | 48.92 mph (78.74 km/h) |
| 55 mph (88.51 km/h) | 53.82 mph (86.61 km/h) |
| 60 mph (96.56 km/h) | 58.71 mph (94.48 km/h) |
| 65 mph (104.61 km/h) | 63.6 mph (102.36 km/h) |
| 70 mph (112.65 km/h) | 68.49 mph (110.23 km/h) |
| 75 mph (120.7 km/h) | 73.39 mph (118.11 km/h) |
| 80 mph (128.75 km/h) | 78.28 mph (125.98 km/h) |
| 85 mph (136.79 km/h) | 83.17 mph (133.85 km/h) |
| 90 mph (144.84 km/h) | 88.06 mph (141.73 km/h) |
| 95 mph (152.89 km/h) | 92.96 mph (149.6 km/h) |
| 100 mph (160.93 km/h) | 97.85 mph (157.47 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1849 | 2148 | 2313 | 2415 | 2525 | 2604 | 2690 | 2793 | 2934 | 3076 | 3233 | 3359 | 3587 | 3839 | 4035 | 4161 | 4232 | 4492 | 4854 | 5640 |
Better Fuel Economy Factory Ratios Increased Power
