Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 31/13.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 30.93 (785.74) | 0.58 (14.74) 1.9% |
| Width inches (mm) | 12.8 (325) | 13.5 (343) | 0.71 (18) 5.5% |
| Circum. inches (mm) | 95.36 (2422.17) | 97.18 (2468.48) | 1.82 (46.31) 1.9% |
| Sidewall Height inches (mm) | 7.68 (195) | 7.97 (202.37) | 0.29 (7.37) 3.8% |
| Revolutions per mile (km) | 664.42 (412.85) | 651.96 (405.11) | -12.46 (-7.74) -1.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.38 mph (32.8 km/h) |
| 25 mph (40.23 km/h) | 25.48 mph (41 km/h) |
| 30 mph (48.28 km/h) | 30.57 mph (49.2 km/h) |
| 35 mph (56.33 km/h) | 35.67 mph (57.4 km/h) |
| 40 mph (64.37 km/h) | 40.76 mph (65.6 km/h) |
| 45 mph (72.42 km/h) | 45.86 mph (73.81 km/h) |
| 50 mph (80.47 km/h) | 50.96 mph (82.01 km/h) |
| 55 mph (88.51 km/h) | 56.05 mph (90.21 km/h) |
| 60 mph (96.56 km/h) | 61.15 mph (98.41 km/h) |
| 65 mph (104.61 km/h) | 66.24 mph (106.61 km/h) |
| 70 mph (112.65 km/h) | 71.34 mph (114.81 km/h) |
| 75 mph (120.7 km/h) | 76.43 mph (123.01 km/h) |
| 80 mph (128.75 km/h) | 81.53 mph (131.21 km/h) |
| 85 mph (136.79 km/h) | 86.63 mph (139.41 km/h) |
| 90 mph (144.84 km/h) | 91.72 mph (147.61 km/h) |
| 95 mph (152.89 km/h) | 96.82 mph (155.81 km/h) |
| 100 mph (160.93 km/h) | 101.91 mph (164.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1659 | 1927 | 2076 | 2167 | 2266 | 2337 | 2415 | 2506 | 2633 | 2760 | 2902 | 3015 | 3219 | 3445 | 3622 | 3735 | 3798 | 4031 | 4356 | 5062 |
Better Fuel Economy Factory Ratios Increased Power
