Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 28/9-15 | 31/18.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.98 (710.76) | 30.91 (785.2) | 2.93 (74.44) 10.5% |
| Width inches (mm) | 9.02 (229) | 18.5 (470) | 9.49 (241) 105.2% |
| Circum. inches (mm) | 87.91 (2232.92) | 97.12 (2466.78) | 9.21 (233.86) 10.5% |
| Sidewall Height inches (mm) | 6.49 (164.88) | 7.96 (202.1) | 1.47 (37.22) 22.6% |
| Revolutions per mile (km) | 720.74 (447.84) | 652.41 (405.39) | -68.33 (-42.46) -9.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.09 mph (35.56 km/h) |
| 25 mph (40.23 km/h) | 27.62 mph (44.45 km/h) |
| 30 mph (48.28 km/h) | 33.14 mph (53.34 km/h) |
| 35 mph (56.33 km/h) | 38.67 mph (62.23 km/h) |
| 40 mph (64.37 km/h) | 44.19 mph (71.12 km/h) |
| 45 mph (72.42 km/h) | 49.71 mph (80.01 km/h) |
| 50 mph (80.47 km/h) | 55.24 mph (88.89 km/h) |
| 55 mph (88.51 km/h) | 60.76 mph (97.78 km/h) |
| 60 mph (96.56 km/h) | 66.28 mph (106.67 km/h) |
| 65 mph (104.61 km/h) | 71.81 mph (115.56 km/h) |
| 70 mph (112.65 km/h) | 77.33 mph (124.45 km/h) |
| 75 mph (120.7 km/h) | 82.85 mph (133.34 km/h) |
| 80 mph (128.75 km/h) | 88.38 mph (142.23 km/h) |
| 85 mph (136.79 km/h) | 93.9 mph (151.12 km/h) |
| 90 mph (144.84 km/h) | 99.43 mph (160.01 km/h) |
| 95 mph (152.89 km/h) | 104.95 mph (168.9 km/h) |
| 100 mph (160.93 km/h) | 110.47 mph (177.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1660 | 1929 | 2077 | 2169 | 2268 | 2338 | 2416 | 2508 | 2635 | 2762 | 2904 | 3017 | 3222 | 3448 | 3624 | 3737 | 3801 | 4034 | 4359 | 5066 |
Better Fuel Economy Factory Ratios Increased Power
