Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/60-15 | 32/12.5-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.35 (771) | 32.03 (813.48) | 1.67 (42.48) 5.5% |
| Width inches (mm) | 12.8 (325) | 12.52 (318) | -0.28 (-7) -2.2% |
| Circum. inches (mm) | 95.36 (2422.17) | 100.62 (2555.62) | 5.25 (133.45) 5.5% |
| Sidewall Height inches (mm) | 7.68 (195) | 8.51 (216.24) | 0.84 (21.24) 10.9% |
| Revolutions per mile (km) | 664.42 (412.85) | 629.73 (391.29) | -34.7 (-21.56) -5.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.1 mph (33.96 km/h) |
| 25 mph (40.23 km/h) | 26.38 mph (42.45 km/h) |
| 30 mph (48.28 km/h) | 31.65 mph (50.94 km/h) |
| 35 mph (56.33 km/h) | 36.93 mph (59.43 km/h) |
| 40 mph (64.37 km/h) | 42.2 mph (67.92 km/h) |
| 45 mph (72.42 km/h) | 47.48 mph (76.41 km/h) |
| 50 mph (80.47 km/h) | 52.75 mph (84.9 km/h) |
| 55 mph (88.51 km/h) | 58.03 mph (93.39 km/h) |
| 60 mph (96.56 km/h) | 63.31 mph (101.88 km/h) |
| 65 mph (104.61 km/h) | 68.58 mph (110.37 km/h) |
| 70 mph (112.65 km/h) | 73.86 mph (118.86 km/h) |
| 75 mph (120.7 km/h) | 79.13 mph (127.35 km/h) |
| 80 mph (128.75 km/h) | 84.41 mph (135.84 km/h) |
| 85 mph (136.79 km/h) | 89.68 mph (144.33 km/h) |
| 90 mph (144.84 km/h) | 94.96 mph (152.82 km/h) |
| 95 mph (152.89 km/h) | 100.23 mph (161.31 km/h) |
| 100 mph (160.93 km/h) | 105.51 mph (169.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1862 | 2005 | 2094 | 2189 | 2257 | 2332 | 2421 | 2544 | 2666 | 2803 | 2912 | 3110 | 3328 | 3498 | 3607 | 3669 | 3894 | 4208 | 4889 |
Better Fuel Economy Factory Ratios Increased Power
