Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/30-21 | 355/25-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.4) | 27.99 (710.9) | -0.69 (-17.5) -2.4% |
| Width inches (mm) | 12.8 (325) | 13.98 (355) | 1.18 (30) 9.2% |
| Circum. inches (mm) | 90.09 (2288.34) | 87.93 (2233.36) | -2.16 (-54.98) -2.4% |
| Sidewall Height inches (mm) | 3.84 (97.5) | 3.49 (88.75) | -0.34 (-8.75) -9% |
| Revolutions per mile (km) | 703.28 (437) | 720.59 (447.76) | 17.31 (10.76) 2.5% |
355/25-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.52 mph (31.41 km/h) |
| 25 mph (40.23 km/h) | 24.4 mph (39.27 km/h) |
| 30 mph (48.28 km/h) | 29.28 mph (47.12 km/h) |
| 35 mph (56.33 km/h) | 34.16 mph (54.97 km/h) |
| 40 mph (64.37 km/h) | 39.04 mph (62.83 km/h) |
| 45 mph (72.42 km/h) | 43.92 mph (70.68 km/h) |
| 50 mph (80.47 km/h) | 48.8 mph (78.53 km/h) |
| 55 mph (88.51 km/h) | 53.68 mph (86.39 km/h) |
| 60 mph (96.56 km/h) | 58.56 mph (94.24 km/h) |
| 65 mph (104.61 km/h) | 63.44 mph (102.09 km/h) |
| 70 mph (112.65 km/h) | 68.32 mph (109.95 km/h) |
| 75 mph (120.7 km/h) | 73.2 mph (117.8 km/h) |
| 80 mph (128.75 km/h) | 78.08 mph (125.65 km/h) |
| 85 mph (136.79 km/h) | 82.96 mph (133.51 km/h) |
| 90 mph (144.84 km/h) | 87.84 mph (141.36 km/h) |
| 95 mph (152.89 km/h) | 92.72 mph (149.21 km/h) |
| 100 mph (160.93 km/h) | 97.6 mph (157.07 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1834 | 2130 | 2294 | 2396 | 2505 | 2583 | 2669 | 2770 | 2911 | 3051 | 3207 | 3332 | 3558 | 3808 | 4003 | 4128 | 4198 | 4456 | 4815 | 5595 |
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