Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 300/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 35.72 (907.2) | 5.31 (135) 17.5% |
| Width inches (mm) | 6.89 (175) | 11.81 (300) | 4.92 (125) 71.4% |
| Circum. inches (mm) | 95.51 (2425.94) | 112.21 (2850.05) | 16.7 (424.12) 17.5% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 8.86 (225) | 2.66 (67.5) 42.9% |
| Revolutions per mile (km) | 663.39 (412.21) | 564.67 (350.87) | -98.72 (-61.34) -14.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.5 mph (37.81 km/h) |
| 25 mph (40.23 km/h) | 29.37 mph (47.27 km/h) |
| 30 mph (48.28 km/h) | 35.24 mph (56.72 km/h) |
| 35 mph (56.33 km/h) | 41.12 mph (66.17 km/h) |
| 40 mph (64.37 km/h) | 46.99 mph (75.63 km/h) |
| 45 mph (72.42 km/h) | 52.87 mph (85.08 km/h) |
| 50 mph (80.47 km/h) | 58.74 mph (94.54 km/h) |
| 55 mph (88.51 km/h) | 64.62 mph (103.99 km/h) |
| 60 mph (96.56 km/h) | 70.49 mph (113.44 km/h) |
| 65 mph (104.61 km/h) | 76.36 mph (122.9 km/h) |
| 70 mph (112.65 km/h) | 82.24 mph (132.35 km/h) |
| 75 mph (120.7 km/h) | 88.11 mph (141.8 km/h) |
| 80 mph (128.75 km/h) | 93.99 mph (151.26 km/h) |
| 85 mph (136.79 km/h) | 99.86 mph (160.71 km/h) |
| 90 mph (144.84 km/h) | 105.73 mph (170.16 km/h) |
| 95 mph (152.89 km/h) | 111.61 mph (179.62 km/h) |
| 100 mph (160.93 km/h) | 117.48 mph (189.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1437 | 1669 | 1798 | 1877 | 1963 | 2024 | 2091 | 2171 | 2281 | 2391 | 2513 | 2611 | 2788 | 2984 | 3137 | 3235 | 3290 | 3492 | 3773 | 4384 |
Better Fuel Economy Factory Ratios Increased Power
