Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/90-18 | 235/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.69 (754.2) | 31.88 (809.7) | 2.19 (55.5) 7.4% |
| Width inches (mm) | 6.5 (165) | 9.25 (235) | 2.76 (70) 42.4% |
| Circum. inches (mm) | 93.28 (2369.39) | 100.15 (2543.75) | 6.86 (174.36) 7.4% |
| Sidewall Height inches (mm) | 5.85 (148.5) | 6.94 (176.25) | 1.09 (27.75) 18.7% |
| Revolutions per mile (km) | 679.22 (422.05) | 632.67 (393.12) | -46.56 (-28.93) -6.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.47 mph (34.56 km/h) |
| 25 mph (40.23 km/h) | 26.84 mph (43.19 km/h) |
| 30 mph (48.28 km/h) | 32.21 mph (51.83 km/h) |
| 35 mph (56.33 km/h) | 37.58 mph (60.47 km/h) |
| 40 mph (64.37 km/h) | 42.94 mph (69.11 km/h) |
| 45 mph (72.42 km/h) | 48.31 mph (77.75 km/h) |
| 50 mph (80.47 km/h) | 53.68 mph (86.39 km/h) |
| 55 mph (88.51 km/h) | 59.05 mph (95.03 km/h) |
| 60 mph (96.56 km/h) | 64.42 mph (103.67 km/h) |
| 65 mph (104.61 km/h) | 69.78 mph (112.31 km/h) |
| 70 mph (112.65 km/h) | 75.15 mph (120.94 km/h) |
| 75 mph (120.7 km/h) | 80.52 mph (129.58 km/h) |
| 80 mph (128.75 km/h) | 85.89 mph (138.22 km/h) |
| 85 mph (136.79 km/h) | 91.25 mph (146.86 km/h) |
| 90 mph (144.84 km/h) | 96.62 mph (155.5 km/h) |
| 95 mph (152.89 km/h) | 101.99 mph (164.14 km/h) |
| 100 mph (160.93 km/h) | 107.36 mph (172.78 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1610 | 1870 | 2014 | 2103 | 2199 | 2268 | 2343 | 2432 | 2555 | 2679 | 2816 | 2925 | 3124 | 3343 | 3515 | 3624 | 3686 | 3912 | 4227 | 4912 |
Better Fuel Economy Factory Ratios Increased Power
