Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-18 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.97 (659.7) | 25.79 (655) | -0.19 (-4.7) -0.7% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 81.59 (2072.51) | 81.01 (2057.74) | -0.58 (-14.77) -0.7% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 2.89 (73.5) | -1.09 (-27.75) -27.4% |
| Revolutions per mile (km) | 776.52 (482.51) | 782.09 (485.97) | 5.57 (3.46) 0.7% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.86 mph (31.96 km/h) |
| 25 mph (40.23 km/h) | 24.82 mph (39.95 km/h) |
| 30 mph (48.28 km/h) | 29.79 mph (47.94 km/h) |
| 35 mph (56.33 km/h) | 34.75 mph (55.93 km/h) |
| 40 mph (64.37 km/h) | 39.72 mph (63.92 km/h) |
| 45 mph (72.42 km/h) | 44.68 mph (71.9 km/h) |
| 50 mph (80.47 km/h) | 49.64 mph (79.89 km/h) |
| 55 mph (88.51 km/h) | 54.61 mph (87.88 km/h) |
| 60 mph (96.56 km/h) | 59.57 mph (95.87 km/h) |
| 65 mph (104.61 km/h) | 64.54 mph (103.86 km/h) |
| 70 mph (112.65 km/h) | 69.5 mph (111.85 km/h) |
| 75 mph (120.7 km/h) | 74.47 mph (119.84 km/h) |
| 80 mph (128.75 km/h) | 79.43 mph (127.83 km/h) |
| 85 mph (136.79 km/h) | 84.39 mph (135.82 km/h) |
| 90 mph (144.84 km/h) | 89.36 mph (143.81 km/h) |
| 95 mph (152.89 km/h) | 94.32 mph (151.8 km/h) |
| 100 mph (160.93 km/h) | 99.29 mph (159.79 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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