Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-20 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673) | 25.79 (655) | -0.71 (-18) -2.7% |
| Width inches (mm) | 10.83 (275) | 9.65 (245) | -1.18 (-30) -10.9% |
| Circum. inches (mm) | 83.24 (2114.29) | 81.01 (2057.74) | -2.23 (-56.55) -2.7% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 2.89 (73.5) | -0.35 (-9) -10.9% |
| Revolutions per mile (km) | 761.17 (472.97) | 782.09 (485.97) | 20.92 (13) 2.7% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.47 mph (31.33 km/h) |
| 25 mph (40.23 km/h) | 24.33 mph (39.16 km/h) |
| 30 mph (48.28 km/h) | 29.2 mph (46.99 km/h) |
| 35 mph (56.33 km/h) | 34.06 mph (54.82 km/h) |
| 40 mph (64.37 km/h) | 38.93 mph (62.65 km/h) |
| 45 mph (72.42 km/h) | 43.8 mph (70.48 km/h) |
| 50 mph (80.47 km/h) | 48.66 mph (78.32 km/h) |
| 55 mph (88.51 km/h) | 53.53 mph (86.15 km/h) |
| 60 mph (96.56 km/h) | 58.4 mph (93.98 km/h) |
| 65 mph (104.61 km/h) | 63.26 mph (101.81 km/h) |
| 70 mph (112.65 km/h) | 68.13 mph (109.64 km/h) |
| 75 mph (120.7 km/h) | 72.99 mph (117.47 km/h) |
| 80 mph (128.75 km/h) | 77.86 mph (125.3 km/h) |
| 85 mph (136.79 km/h) | 82.73 mph (133.14 km/h) |
| 90 mph (144.84 km/h) | 87.59 mph (140.97 km/h) |
| 95 mph (152.89 km/h) | 92.46 mph (148.8 km/h) |
| 100 mph (160.93 km/h) | 97.33 mph (156.63 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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