Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 280/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 32.33 (821.2) | 6.63 (168.5) 25.8% |
| Width inches (mm) | 4.53 (115) | 11.02 (280) | 6.5 (165) 143.5% |
| Circum. inches (mm) | 80.73 (2050.52) | 101.57 (2579.88) | 20.84 (529.36) 25.8% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 7.17 (182) | 3.32 (84.25) 86.2% |
| Revolutions per mile (km) | 784.85 (487.68) | 623.81 (387.61) | -161.04 (-100.07) -20.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.16 mph (40.5 km/h) |
| 25 mph (40.23 km/h) | 31.45 mph (50.62 km/h) |
| 30 mph (48.28 km/h) | 37.74 mph (60.74 km/h) |
| 35 mph (56.33 km/h) | 44.04 mph (70.87 km/h) |
| 40 mph (64.37 km/h) | 50.33 mph (80.99 km/h) |
| 45 mph (72.42 km/h) | 56.62 mph (91.12 km/h) |
| 50 mph (80.47 km/h) | 62.91 mph (101.24 km/h) |
| 55 mph (88.51 km/h) | 69.2 mph (111.36 km/h) |
| 60 mph (96.56 km/h) | 75.49 mph (121.49 km/h) |
| 65 mph (104.61 km/h) | 81.78 mph (131.61 km/h) |
| 70 mph (112.65 km/h) | 88.07 mph (141.74 km/h) |
| 75 mph (120.7 km/h) | 94.36 mph (151.86 km/h) |
| 80 mph (128.75 km/h) | 100.65 mph (161.99 km/h) |
| 85 mph (136.79 km/h) | 106.94 mph (172.11 km/h) |
| 90 mph (144.84 km/h) | 113.23 mph (182.23 km/h) |
| 95 mph (152.89 km/h) | 119.53 mph (192.36 km/h) |
| 100 mph (160.93 km/h) | 125.82 mph (202.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1587 | 1844 | 1986 | 2074 | 2168 | 2236 | 2310 | 2398 | 2520 | 2641 | 2776 | 2884 | 3080 | 3297 | 3465 | 3573 | 3634 | 3857 | 4168 | 4843 |
Better Fuel Economy Factory Ratios Increased Power
