Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 235/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 32.8 (833.2) | 5.59 (142) 20.5% |
| Width inches (mm) | 7.09 (180) | 9.25 (235) | 2.17 (55) 30.6% |
| Circum. inches (mm) | 85.49 (2171.47) | 103.05 (2617.57) | 17.56 (446.11) 20.5% |
| Sidewall Height inches (mm) | 4.61 (117) | 7.4 (188) | 2.8 (71) 60.7% |
| Revolutions per mile (km) | 741.13 (460.52) | 614.82 (382.03) | -126.31 (-78.48) -17% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.11 mph (38.8 km/h) |
| 25 mph (40.23 km/h) | 30.14 mph (48.5 km/h) |
| 30 mph (48.28 km/h) | 36.16 mph (58.2 km/h) |
| 35 mph (56.33 km/h) | 42.19 mph (67.9 km/h) |
| 40 mph (64.37 km/h) | 48.22 mph (77.6 km/h) |
| 45 mph (72.42 km/h) | 54.24 mph (87.3 km/h) |
| 50 mph (80.47 km/h) | 60.27 mph (97 km/h) |
| 55 mph (88.51 km/h) | 66.3 mph (106.7 km/h) |
| 60 mph (96.56 km/h) | 72.33 mph (116.4 km/h) |
| 65 mph (104.61 km/h) | 78.35 mph (126.1 km/h) |
| 70 mph (112.65 km/h) | 84.38 mph (135.8 km/h) |
| 75 mph (120.7 km/h) | 90.41 mph (145.5 km/h) |
| 80 mph (128.75 km/h) | 96.44 mph (155.2 km/h) |
| 85 mph (136.79 km/h) | 102.46 mph (164.9 km/h) |
| 90 mph (144.84 km/h) | 108.49 mph (174.6 km/h) |
| 95 mph (152.89 km/h) | 114.52 mph (184.3 km/h) |
| 100 mph (160.93 km/h) | 120.54 mph (194 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1565 | 1818 | 1957 | 2044 | 2137 | 2204 | 2277 | 2364 | 2483 | 2603 | 2736 | 2843 | 3036 | 3249 | 3416 | 3522 | 3582 | 3802 | 4108 | 4774 |
Better Fuel Economy Factory Ratios Increased Power
