Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/30-18 | 285/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.55 (598.2) | 24.73 (628.2) | 1.18 (30) 5% |
| Width inches (mm) | 9.25 (235) | 11.22 (285) | 1.97 (50) 21.3% |
| Circum. inches (mm) | 73.99 (1879.3) | 77.7 (1973.55) | 3.71 (94.25) 5% |
| Sidewall Height inches (mm) | 2.78 (70.5) | 3.37 (85.5) | 0.59 (15) 21.3% |
| Revolutions per mile (km) | 856.35 (532.11) | 815.46 (506.7) | -40.9 (-25.41) -4.8% |
285/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21 mph (33.8 km/h) |
| 25 mph (40.23 km/h) | 26.25 mph (42.25 km/h) |
| 30 mph (48.28 km/h) | 31.5 mph (50.7 km/h) |
| 35 mph (56.33 km/h) | 36.76 mph (59.15 km/h) |
| 40 mph (64.37 km/h) | 42.01 mph (67.6 km/h) |
| 45 mph (72.42 km/h) | 47.26 mph (76.05 km/h) |
| 50 mph (80.47 km/h) | 52.51 mph (84.5 km/h) |
| 55 mph (88.51 km/h) | 57.76 mph (92.95 km/h) |
| 60 mph (96.56 km/h) | 63.01 mph (101.4 km/h) |
| 65 mph (104.61 km/h) | 68.26 mph (109.85 km/h) |
| 70 mph (112.65 km/h) | 73.51 mph (118.3 km/h) |
| 75 mph (120.7 km/h) | 78.76 mph (126.75 km/h) |
| 80 mph (128.75 km/h) | 84.01 mph (135.2 km/h) |
| 85 mph (136.79 km/h) | 89.26 mph (143.65 km/h) |
| 90 mph (144.84 km/h) | 94.51 mph (152.11 km/h) |
| 95 mph (152.89 km/h) | 99.76 mph (160.56 km/h) |
| 100 mph (160.93 km/h) | 105.02 mph (169.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2075 | 2411 | 2596 | 2711 | 2835 | 2923 | 3020 | 3135 | 3294 | 3453 | 3629 | 3771 | 4027 | 4309 | 4530 | 4671 | 4751 | 5042 | 5448 | 6332 |
Better Fuel Economy Factory Ratios Increased Power
