Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/30-18 | 275/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.73 (628.2) | 24.5 (622.2) | -0.24 (-6) -1% |
| Width inches (mm) | 11.22 (285) | 10.83 (275) | -0.39 (-10) -3.5% |
| Circum. inches (mm) | 77.7 (1973.55) | 76.96 (1954.7) | -0.74 (-18.85) -1% |
| Sidewall Height inches (mm) | 3.37 (85.5) | 3.25 (82.5) | -0.12 (-3) -3.5% |
| Revolutions per mile (km) | 815.46 (506.7) | 823.32 (511.59) | 7.86 (4.89) 1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.81 mph (31.88 km/h) |
| 25 mph (40.23 km/h) | 24.76 mph (39.85 km/h) |
| 30 mph (48.28 km/h) | 29.71 mph (47.82 km/h) |
| 35 mph (56.33 km/h) | 34.67 mph (55.79 km/h) |
| 40 mph (64.37 km/h) | 39.62 mph (63.76 km/h) |
| 45 mph (72.42 km/h) | 44.57 mph (71.73 km/h) |
| 50 mph (80.47 km/h) | 49.52 mph (79.7 km/h) |
| 55 mph (88.51 km/h) | 54.47 mph (87.67 km/h) |
| 60 mph (96.56 km/h) | 59.43 mph (95.64 km/h) |
| 65 mph (104.61 km/h) | 64.38 mph (103.61 km/h) |
| 70 mph (112.65 km/h) | 69.33 mph (111.58 km/h) |
| 75 mph (120.7 km/h) | 74.28 mph (119.55 km/h) |
| 80 mph (128.75 km/h) | 79.24 mph (127.52 km/h) |
| 85 mph (136.79 km/h) | 84.19 mph (135.49 km/h) |
| 90 mph (144.84 km/h) | 89.14 mph (143.46 km/h) |
| 95 mph (152.89 km/h) | 94.09 mph (151.43 km/h) |
| 100 mph (160.93 km/h) | 99.04 mph (159.4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2095 | 2434 | 2621 | 2737 | 2862 | 2951 | 3049 | 3165 | 3326 | 3486 | 3664 | 3807 | 4066 | 4351 | 4574 | 4716 | 4797 | 5091 | 5501 | 6393 |
Better Fuel Economy Factory Ratios Increased Power
