Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 33/12.5-24 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 33.01 (838.56) | 5.62 (142.66) 20.5% |
| Width inches (mm) | 12.8 (325) | 12.52 (318) | -0.28 (-7) -2.2% |
| Circum. inches (mm) | 86.07 (2186.23) | 103.72 (2634.41) | 17.64 (448.18) 20.5% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 4.51 (114.48) | 1.31 (33.23) 40.9% |
| Revolutions per mile (km) | 736.13 (457.41) | 610.89 (379.59) | -125.23 (-77.82) -17% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.1 mph (38.79 km/h) |
| 25 mph (40.23 km/h) | 30.13 mph (48.48 km/h) |
| 30 mph (48.28 km/h) | 36.15 mph (58.18 km/h) |
| 35 mph (56.33 km/h) | 42.18 mph (67.87 km/h) |
| 40 mph (64.37 km/h) | 48.2 mph (77.57 km/h) |
| 45 mph (72.42 km/h) | 54.23 mph (87.27 km/h) |
| 50 mph (80.47 km/h) | 60.25 mph (96.96 km/h) |
| 55 mph (88.51 km/h) | 66.28 mph (106.66 km/h) |
| 60 mph (96.56 km/h) | 72.3 mph (116.36 km/h) |
| 65 mph (104.61 km/h) | 78.33 mph (126.05 km/h) |
| 70 mph (112.65 km/h) | 84.35 mph (135.75 km/h) |
| 75 mph (120.7 km/h) | 90.38 mph (145.44 km/h) |
| 80 mph (128.75 km/h) | 96.4 mph (155.14 km/h) |
| 85 mph (136.79 km/h) | 102.43 mph (164.84 km/h) |
| 90 mph (144.84 km/h) | 108.45 mph (174.53 km/h) |
| 95 mph (152.89 km/h) | 114.48 mph (184.23 km/h) |
| 100 mph (160.93 km/h) | 120.5 mph (193.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1555 | 1806 | 1945 | 2031 | 2124 | 2190 | 2262 | 2348 | 2468 | 2587 | 2719 | 2825 | 3017 | 3228 | 3394 | 3500 | 3559 | 3777 | 4082 | 4743 |
Better Fuel Economy Factory Ratios Increased Power
