Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/90-18 | 385/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.69 (754.2) | 39.22 (996.2) | 9.53 (242) 32.1% |
| Width inches (mm) | 6.5 (165) | 15.16 (385) | 8.66 (220) 133.3% |
| Circum. inches (mm) | 93.28 (2369.39) | 123.21 (3129.65) | 29.93 (760.27) 32.1% |
| Sidewall Height inches (mm) | 5.85 (148.5) | 10.61 (269.5) | 4.76 (121) 81.5% |
| Revolutions per mile (km) | 679.22 (422.05) | 514.22 (319.52) | -165 (-102.53) -24.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.42 mph (42.51 km/h) |
| 25 mph (40.23 km/h) | 33.02 mph (53.14 km/h) |
| 30 mph (48.28 km/h) | 39.63 mph (63.77 km/h) |
| 35 mph (56.33 km/h) | 46.23 mph (74.4 km/h) |
| 40 mph (64.37 km/h) | 52.83 mph (85.03 km/h) |
| 45 mph (72.42 km/h) | 59.44 mph (95.66 km/h) |
| 50 mph (80.47 km/h) | 66.04 mph (106.29 km/h) |
| 55 mph (88.51 km/h) | 72.65 mph (116.92 km/h) |
| 60 mph (96.56 km/h) | 79.25 mph (127.54 km/h) |
| 65 mph (104.61 km/h) | 85.86 mph (138.17 km/h) |
| 70 mph (112.65 km/h) | 92.46 mph (148.8 km/h) |
| 75 mph (120.7 km/h) | 99.07 mph (159.43 km/h) |
| 80 mph (128.75 km/h) | 105.67 mph (170.06 km/h) |
| 85 mph (136.79 km/h) | 112.27 mph (180.69 km/h) |
| 90 mph (144.84 km/h) | 118.88 mph (191.32 km/h) |
| 95 mph (152.89 km/h) | 125.48 mph (201.95 km/h) |
| 100 mph (160.93 km/h) | 132.09 mph (212.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1309 | 1520 | 1637 | 1710 | 1787 | 1843 | 1904 | 1977 | 2077 | 2177 | 2289 | 2378 | 2539 | 2717 | 2857 | 2946 | 2996 | 3180 | 3436 | 3993 |
Better Fuel Economy Factory Ratios Increased Power
