Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 325/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 28.68 (728.4) | 0.71 (18) 2.5% |
| Width inches (mm) | 11.61 (295) | 12.8 (325) | 1.18 (30) 10.2% |
| Circum. inches (mm) | 87.87 (2231.79) | 90.09 (2288.34) | 2.23 (56.55) 2.5% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 3.84 (97.5) | 0.35 (9) 10.2% |
| Revolutions per mile (km) | 721.1 (448.07) | 703.28 (437) | -17.82 (-11.07) -2.5% |
325/30-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.51 mph (33 km/h) |
| 25 mph (40.23 km/h) | 25.63 mph (41.25 km/h) |
| 30 mph (48.28 km/h) | 30.76 mph (49.5 km/h) |
| 35 mph (56.33 km/h) | 35.89 mph (57.75 km/h) |
| 40 mph (64.37 km/h) | 41.01 mph (66 km/h) |
| 45 mph (72.42 km/h) | 46.14 mph (74.26 km/h) |
| 50 mph (80.47 km/h) | 51.27 mph (82.51 km/h) |
| 55 mph (88.51 km/h) | 56.39 mph (90.76 km/h) |
| 60 mph (96.56 km/h) | 61.52 mph (99.01 km/h) |
| 65 mph (104.61 km/h) | 66.65 mph (107.26 km/h) |
| 70 mph (112.65 km/h) | 71.77 mph (115.51 km/h) |
| 75 mph (120.7 km/h) | 76.9 mph (123.76 km/h) |
| 80 mph (128.75 km/h) | 82.03 mph (132.01 km/h) |
| 85 mph (136.79 km/h) | 87.15 mph (140.26 km/h) |
| 90 mph (144.84 km/h) | 92.28 mph (148.51 km/h) |
| 95 mph (152.89 km/h) | 97.41 mph (156.76 km/h) |
| 100 mph (160.93 km/h) | 102.53 mph (165.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1790 | 2079 | 2239 | 2338 | 2445 | 2521 | 2605 | 2704 | 2841 | 2978 | 3130 | 3252 | 3473 | 3717 | 3907 | 4029 | 4097 | 4349 | 4699 | 5461 |
Better Fuel Economy Factory Ratios Increased Power
