Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 280/85-16 | 30/12.5-16 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.74 (882.4) | 30.02 (762.56) | -4.72 (-119.84) -13.6% |
| Width inches (mm) | 11.02 (280) | 12.52 (318) | 1.5 (38) 13.6% |
| Circum. inches (mm) | 109.14 (2772.14) | 94.32 (2395.65) | -14.82 (-376.49) -13.6% |
| Sidewall Height inches (mm) | 9.37 (238) | 7.01 (178.08) | -2.36 (-59.92) -25.2% |
| Revolutions per mile (km) | 580.54 (360.73) | 671.78 (417.42) | 91.23 (56.69) 15.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.28 mph (27.82 km/h) |
| 25 mph (40.23 km/h) | 21.6 mph (34.77 km/h) |
| 30 mph (48.28 km/h) | 25.93 mph (41.72 km/h) |
| 35 mph (56.33 km/h) | 30.25 mph (48.68 km/h) |
| 40 mph (64.37 km/h) | 34.57 mph (55.63 km/h) |
| 45 mph (72.42 km/h) | 38.89 mph (62.59 km/h) |
| 50 mph (80.47 km/h) | 43.21 mph (69.54 km/h) |
| 55 mph (88.51 km/h) | 47.53 mph (76.49 km/h) |
| 60 mph (96.56 km/h) | 51.85 mph (83.45 km/h) |
| 65 mph (104.61 km/h) | 56.17 mph (90.4 km/h) |
| 70 mph (112.65 km/h) | 60.49 mph (97.35 km/h) |
| 75 mph (120.7 km/h) | 64.81 mph (104.31 km/h) |
| 80 mph (128.75 km/h) | 69.14 mph (111.26 km/h) |
| 85 mph (136.79 km/h) | 73.46 mph (118.22 km/h) |
| 90 mph (144.84 km/h) | 77.78 mph (125.17 km/h) |
| 95 mph (152.89 km/h) | 82.1 mph (132.12 km/h) |
| 100 mph (160.93 km/h) | 86.42 mph (139.08 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1710 | 1986 | 2139 | 2233 | 2335 | 2408 | 2488 | 2583 | 2713 | 2844 | 2990 | 3106 | 3317 | 3550 | 3732 | 3848 | 3914 | 4154 | 4488 | 5216 |
Better Fuel Economy Factory Ratios Increased Power
