Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-20 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 25.79 (655) | -2.89 (-73.5) -10.1% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 90.1 (2288.65) | 81.01 (2057.74) | -9.09 (-230.91) -10.1% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 2.89 (73.5) | -1.45 (-36.75) -33.3% |
| Revolutions per mile (km) | 703.18 (436.94) | 782.09 (485.97) | 78.91 (49.03) 11.2% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.98 mph (28.94 km/h) |
| 25 mph (40.23 km/h) | 22.48 mph (36.17 km/h) |
| 30 mph (48.28 km/h) | 26.97 mph (43.41 km/h) |
| 35 mph (56.33 km/h) | 31.47 mph (50.64 km/h) |
| 40 mph (64.37 km/h) | 35.96 mph (57.88 km/h) |
| 45 mph (72.42 km/h) | 40.46 mph (65.11 km/h) |
| 50 mph (80.47 km/h) | 44.96 mph (72.35 km/h) |
| 55 mph (88.51 km/h) | 49.45 mph (79.58 km/h) |
| 60 mph (96.56 km/h) | 53.95 mph (86.82 km/h) |
| 65 mph (104.61 km/h) | 58.44 mph (94.05 km/h) |
| 70 mph (112.65 km/h) | 62.94 mph (101.29 km/h) |
| 75 mph (120.7 km/h) | 67.43 mph (108.52 km/h) |
| 80 mph (128.75 km/h) | 71.93 mph (115.76 km/h) |
| 85 mph (136.79 km/h) | 76.42 mph (122.99 km/h) |
| 90 mph (144.84 km/h) | 80.92 mph (130.23 km/h) |
| 95 mph (152.89 km/h) | 85.42 mph (137.46 km/h) |
| 100 mph (160.93 km/h) | 89.91 mph (144.7 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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