Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-20 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.02 (661) | 25.79 (655) | -0.24 (-6) -0.9% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 81.76 (2076.59) | 81.01 (2057.74) | -0.74 (-18.85) -0.9% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 2.89 (73.5) | -0.12 (-3) -3.9% |
| Revolutions per mile (km) | 774.99 (481.56) | 782.09 (485.97) | 7.1 (4.41) 0.9% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.82 mph (31.89 km/h) |
| 25 mph (40.23 km/h) | 24.77 mph (39.87 km/h) |
| 30 mph (48.28 km/h) | 29.73 mph (47.84 km/h) |
| 35 mph (56.33 km/h) | 34.68 mph (55.82 km/h) |
| 40 mph (64.37 km/h) | 39.64 mph (63.79 km/h) |
| 45 mph (72.42 km/h) | 44.59 mph (71.76 km/h) |
| 50 mph (80.47 km/h) | 49.55 mph (79.74 km/h) |
| 55 mph (88.51 km/h) | 54.5 mph (87.71 km/h) |
| 60 mph (96.56 km/h) | 59.46 mph (95.68 km/h) |
| 65 mph (104.61 km/h) | 64.41 mph (103.66 km/h) |
| 70 mph (112.65 km/h) | 69.36 mph (111.63 km/h) |
| 75 mph (120.7 km/h) | 74.32 mph (119.61 km/h) |
| 80 mph (128.75 km/h) | 79.27 mph (127.58 km/h) |
| 85 mph (136.79 km/h) | 84.23 mph (135.55 km/h) |
| 90 mph (144.84 km/h) | 89.18 mph (143.53 km/h) |
| 95 mph (152.89 km/h) | 94.14 mph (151.5 km/h) |
| 100 mph (160.93 km/h) | 99.09 mph (159.47 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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