Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/25-21 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (695.9) | 25.79 (655) | -1.61 (-40.9) -5.9% |
| Width inches (mm) | 12.8 (325) | 9.65 (245) | -3.15 (-80) -24.6% |
| Circum. inches (mm) | 86.07 (2186.23) | 81.01 (2057.74) | -5.06 (-128.49) -5.9% |
| Sidewall Height inches (mm) | 3.2 (81.25) | 2.89 (73.5) | -0.31 (-7.75) -9.5% |
| Revolutions per mile (km) | 736.13 (457.41) | 782.09 (485.97) | 45.97 (28.56) 6.2% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.82 mph (30.3 km/h) |
| 25 mph (40.23 km/h) | 23.53 mph (37.87 km/h) |
| 30 mph (48.28 km/h) | 28.24 mph (45.44 km/h) |
| 35 mph (56.33 km/h) | 32.94 mph (53.02 km/h) |
| 40 mph (64.37 km/h) | 37.65 mph (60.59 km/h) |
| 45 mph (72.42 km/h) | 42.36 mph (68.16 km/h) |
| 50 mph (80.47 km/h) | 47.06 mph (75.74 km/h) |
| 55 mph (88.51 km/h) | 51.77 mph (83.31 km/h) |
| 60 mph (96.56 km/h) | 56.47 mph (90.89 km/h) |
| 65 mph (104.61 km/h) | 61.18 mph (98.46 km/h) |
| 70 mph (112.65 km/h) | 65.89 mph (106.03 km/h) |
| 75 mph (120.7 km/h) | 70.59 mph (113.61 km/h) |
| 80 mph (128.75 km/h) | 75.3 mph (121.18 km/h) |
| 85 mph (136.79 km/h) | 80 mph (128.75 km/h) |
| 90 mph (144.84 km/h) | 84.71 mph (136.33 km/h) |
| 95 mph (152.89 km/h) | 89.42 mph (143.9 km/h) |
| 100 mph (160.93 km/h) | 94.12 mph (151.48 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2312 | 2490 | 2600 | 2719 | 2803 | 2896 | 3007 | 3159 | 3311 | 3481 | 3616 | 3862 | 4133 | 4345 | 4480 | 4556 | 4836 | 5226 | 6072 |
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