Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 325/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 27.4 (695.9) | -0.59 (-15) -2.1% |
| Width inches (mm) | 13.98 (355) | 12.8 (325) | -1.18 (-30) -8.5% |
| Circum. inches (mm) | 87.93 (2233.36) | 86.07 (2186.23) | -1.86 (-47.12) -2.1% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.2 (81.25) | -0.3 (-7.5) -8.5% |
| Revolutions per mile (km) | 720.59 (447.76) | 736.13 (457.41) | 15.53 (9.65) 2.2% |
325/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.47 mph (39.38 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.26 km/h) |
| 35 mph (56.33 km/h) | 34.26 mph (55.14 km/h) |
| 40 mph (64.37 km/h) | 39.16 mph (63.02 km/h) |
| 45 mph (72.42 km/h) | 44.05 mph (70.89 km/h) |
| 50 mph (80.47 km/h) | 48.94 mph (78.77 km/h) |
| 55 mph (88.51 km/h) | 53.84 mph (86.65 km/h) |
| 60 mph (96.56 km/h) | 58.73 mph (94.52 km/h) |
| 65 mph (104.61 km/h) | 63.63 mph (102.4 km/h) |
| 70 mph (112.65 km/h) | 68.52 mph (110.28 km/h) |
| 75 mph (120.7 km/h) | 73.42 mph (118.15 km/h) |
| 80 mph (128.75 km/h) | 78.31 mph (126.03 km/h) |
| 85 mph (136.79 km/h) | 83.21 mph (133.91 km/h) |
| 90 mph (144.84 km/h) | 88.1 mph (141.79 km/h) |
| 95 mph (152.89 km/h) | 93 mph (149.66 km/h) |
| 100 mph (160.93 km/h) | 97.89 mph (157.54 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1873 | 2176 | 2344 | 2447 | 2559 | 2639 | 2726 | 2830 | 2973 | 3117 | 3276 | 3404 | 3635 | 3890 | 4089 | 4217 | 4289 | 4552 | 4918 | 5716 |
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