Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 28.68 (728.5) | -0.04 (-0.9) -0.1% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 90.22 (2291.48) | 90.1 (2288.65) | -0.11 (-2.83) -0.1% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.34 (110.25) | 0.48 (12.25) 12.5% |
| Revolutions per mile (km) | 702.32 (436.4) | 703.18 (436.94) | 0.87 (0.54) 0.1% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.98 mph (32.15 km/h) |
| 25 mph (40.23 km/h) | 24.97 mph (40.18 km/h) |
| 30 mph (48.28 km/h) | 29.96 mph (48.22 km/h) |
| 35 mph (56.33 km/h) | 34.96 mph (56.26 km/h) |
| 40 mph (64.37 km/h) | 39.95 mph (64.29 km/h) |
| 45 mph (72.42 km/h) | 44.94 mph (72.33 km/h) |
| 50 mph (80.47 km/h) | 49.94 mph (80.37 km/h) |
| 55 mph (88.51 km/h) | 54.93 mph (88.4 km/h) |
| 60 mph (96.56 km/h) | 59.93 mph (96.44 km/h) |
| 65 mph (104.61 km/h) | 64.92 mph (104.48 km/h) |
| 70 mph (112.65 km/h) | 69.91 mph (112.52 km/h) |
| 75 mph (120.7 km/h) | 74.91 mph (120.55 km/h) |
| 80 mph (128.75 km/h) | 79.9 mph (128.59 km/h) |
| 85 mph (136.79 km/h) | 84.9 mph (136.63 km/h) |
| 90 mph (144.84 km/h) | 89.89 mph (144.66 km/h) |
| 95 mph (152.89 km/h) | 94.88 mph (152.7 km/h) |
| 100 mph (160.93 km/h) | 99.88 mph (160.74 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
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