Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-21 | 325/30-22 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27 (685.9) | 29.68 (753.8) | 2.67 (67.9) 9.9% |
| Width inches (mm) | 12.01 (305) | 12.8 (325) | 0.79 (20) 6.6% |
| Circum. inches (mm) | 84.84 (2154.82) | 93.23 (2368.13) | 8.4 (213.31) 9.9% |
| Sidewall Height inches (mm) | 3 (76.25) | 3.84 (97.5) | 0.84 (21.25) 27.9% |
| Revolutions per mile (km) | 746.86 (464.08) | 679.58 (422.27) | -67.27 (-41.8) -9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.98 mph (35.37 km/h) |
| 25 mph (40.23 km/h) | 27.47 mph (44.22 km/h) |
| 30 mph (48.28 km/h) | 32.97 mph (53.06 km/h) |
| 35 mph (56.33 km/h) | 38.46 mph (61.9 km/h) |
| 40 mph (64.37 km/h) | 43.96 mph (70.75 km/h) |
| 45 mph (72.42 km/h) | 49.45 mph (79.59 km/h) |
| 50 mph (80.47 km/h) | 54.95 mph (88.43 km/h) |
| 55 mph (88.51 km/h) | 60.44 mph (97.28 km/h) |
| 60 mph (96.56 km/h) | 65.94 mph (106.12 km/h) |
| 65 mph (104.61 km/h) | 71.43 mph (114.96 km/h) |
| 70 mph (112.65 km/h) | 76.93 mph (123.81 km/h) |
| 75 mph (120.7 km/h) | 82.42 mph (132.65 km/h) |
| 80 mph (128.75 km/h) | 87.92 mph (141.49 km/h) |
| 85 mph (136.79 km/h) | 93.41 mph (150.34 km/h) |
| 90 mph (144.84 km/h) | 98.91 mph (159.18 km/h) |
| 95 mph (152.89 km/h) | 104.4 mph (168.02 km/h) |
| 100 mph (160.93 km/h) | 109.9 mph (176.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1729 | 2009 | 2164 | 2259 | 2362 | 2436 | 2517 | 2613 | 2745 | 2877 | 3025 | 3142 | 3356 | 3591 | 3775 | 3893 | 3959 | 4202 | 4541 | 5277 |
Better Fuel Economy Factory Ratios Increased Power
