Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/70-15 | 280/68-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.89 (556) | 32.99 (838) | 11.1 (282) 50.7% |
| Width inches (mm) | 4.92 (125) | 11.02 (280) | 6.1 (155) 124% |
| Circum. inches (mm) | 68.77 (1746.73) | 103.65 (2632.65) | 34.88 (885.93) 50.7% |
| Sidewall Height inches (mm) | 3.44 (87.5) | 7.5 (190.4) | 4.05 (102.9) 117.6% |
| Revolutions per mile (km) | 921.35 (572.5) | 611.3 (379.84) | -310.05 (-192.65) -33.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 30.14 mph (48.51 km/h) |
| 25 mph (40.23 km/h) | 37.68 mph (60.64 km/h) |
| 30 mph (48.28 km/h) | 45.22 mph (72.77 km/h) |
| 35 mph (56.33 km/h) | 52.75 mph (84.9 km/h) |
| 40 mph (64.37 km/h) | 60.29 mph (97.02 km/h) |
| 45 mph (72.42 km/h) | 67.82 mph (109.15 km/h) |
| 50 mph (80.47 km/h) | 75.36 mph (121.28 km/h) |
| 55 mph (88.51 km/h) | 82.9 mph (133.41 km/h) |
| 60 mph (96.56 km/h) | 90.43 mph (145.54 km/h) |
| 65 mph (104.61 km/h) | 97.97 mph (157.66 km/h) |
| 70 mph (112.65 km/h) | 105.5 mph (169.79 km/h) |
| 75 mph (120.7 km/h) | 113.04 mph (181.92 km/h) |
| 80 mph (128.75 km/h) | 120.58 mph (194.05 km/h) |
| 85 mph (136.79 km/h) | 128.11 mph (206.18 km/h) |
| 90 mph (144.84 km/h) | 135.65 mph (218.3 km/h) |
| 95 mph (152.89 km/h) | 143.18 mph (230.43 km/h) |
| 100 mph (160.93 km/h) | 150.72 mph (242.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1556 | 1807 | 1946 | 2032 | 2125 | 2191 | 2264 | 2350 | 2469 | 2588 | 2721 | 2827 | 3019 | 3230 | 3396 | 3502 | 3561 | 3780 | 4084 | 4746 |
Better Fuel Economy Factory Ratios Increased Power
