Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 375/40-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 35.81 (909.6) | 8.41 (213.7) 30.7% |
| Width inches (mm) | 12.8 (325) | 14.76 (375) | 1.97 (50) 15.4% |
| Circum. inches (mm) | 86.07 (2186.23) | 112.5 (2857.59) | 26.43 (671.36) 30.7% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 5.91 (150) | 2.71 (68.75) 84.6% |
| Revolutions per mile (km) | 736.13 (457.41) | 563.18 (349.94) | -172.94 (-107.46) -23.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.14 mph (42.07 km/h) |
| 25 mph (40.23 km/h) | 32.68 mph (52.59 km/h) |
| 30 mph (48.28 km/h) | 39.21 mph (63.11 km/h) |
| 35 mph (56.33 km/h) | 45.75 mph (73.62 km/h) |
| 40 mph (64.37 km/h) | 52.28 mph (84.14 km/h) |
| 45 mph (72.42 km/h) | 58.82 mph (94.66 km/h) |
| 50 mph (80.47 km/h) | 65.35 mph (105.18 km/h) |
| 55 mph (88.51 km/h) | 71.89 mph (115.7 km/h) |
| 60 mph (96.56 km/h) | 78.43 mph (126.21 km/h) |
| 65 mph (104.61 km/h) | 84.96 mph (136.73 km/h) |
| 70 mph (112.65 km/h) | 91.5 mph (147.25 km/h) |
| 75 mph (120.7 km/h) | 98.03 mph (157.77 km/h) |
| 80 mph (128.75 km/h) | 104.57 mph (168.28 km/h) |
| 85 mph (136.79 km/h) | 111.1 mph (178.8 km/h) |
| 90 mph (144.84 km/h) | 117.64 mph (189.32 km/h) |
| 95 mph (152.89 km/h) | 124.17 mph (199.84 km/h) |
| 100 mph (160.93 km/h) | 130.71 mph (210.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1433 | 1665 | 1793 | 1872 | 1958 | 2019 | 2086 | 2165 | 2275 | 2385 | 2507 | 2604 | 2781 | 2976 | 3129 | 3226 | 3281 | 3482 | 3763 | 4373 |
Better Fuel Economy Factory Ratios Increased Power
