Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 31/18.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 30.91 (785.2) | 0.56 (14.2) 1.8% |
| Width inches (mm) | 12.8 (325) | 18.5 (470) | 5.71 (145) 44.6% |
| Circum. inches (mm) | 95.36 (2422.17) | 97.12 (2466.78) | 1.76 (44.61) 1.8% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.96 (202.1) | 0.28 (7.1) 3.6% |
| Revolutions per mile (km) | 664.42 (412.85) | 652.41 (405.39) | -12.02 (-7.47) -1.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.37 mph (32.78 km/h) |
| 25 mph (40.23 km/h) | 25.46 mph (40.97 km/h) |
| 30 mph (48.28 km/h) | 30.55 mph (49.17 km/h) |
| 35 mph (56.33 km/h) | 35.64 mph (57.36 km/h) |
| 40 mph (64.37 km/h) | 40.74 mph (65.56 km/h) |
| 45 mph (72.42 km/h) | 45.83 mph (73.75 km/h) |
| 50 mph (80.47 km/h) | 50.92 mph (81.95 km/h) |
| 55 mph (88.51 km/h) | 56.01 mph (90.14 km/h) |
| 60 mph (96.56 km/h) | 61.11 mph (98.34 km/h) |
| 65 mph (104.61 km/h) | 66.2 mph (106.53 km/h) |
| 70 mph (112.65 km/h) | 71.29 mph (114.73 km/h) |
| 75 mph (120.7 km/h) | 76.38 mph (122.92 km/h) |
| 80 mph (128.75 km/h) | 81.47 mph (131.12 km/h) |
| 85 mph (136.79 km/h) | 86.57 mph (139.31 km/h) |
| 90 mph (144.84 km/h) | 91.66 mph (147.51 km/h) |
| 95 mph (152.89 km/h) | 96.75 mph (155.7 km/h) |
| 100 mph (160.93 km/h) | 101.84 mph (163.9 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
