Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/70-19 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.89 (657.6) | 29.04 (737.5) | 3.15 (79.9) 12.2% |
| Width inches (mm) | 4.92 (125) | 10.04 (255) | 5.12 (130) 104% |
| Circum. inches (mm) | 81.34 (2065.91) | 91.22 (2316.92) | 9.88 (251.01) 12.2% |
| Sidewall Height inches (mm) | 3.44 (87.5) | 4.52 (114.75) | 1.07 (27.25) 31.1% |
| Revolutions per mile (km) | 779 (484.05) | 694.6 (431.61) | -84.4 (-52.44) -10.8% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.43 mph (36.1 km/h) |
| 25 mph (40.23 km/h) | 28.04 mph (45.12 km/h) |
| 30 mph (48.28 km/h) | 33.65 mph (54.15 km/h) |
| 35 mph (56.33 km/h) | 39.25 mph (63.17 km/h) |
| 40 mph (64.37 km/h) | 44.86 mph (72.2 km/h) |
| 45 mph (72.42 km/h) | 50.47 mph (81.22 km/h) |
| 50 mph (80.47 km/h) | 56.08 mph (90.24 km/h) |
| 55 mph (88.51 km/h) | 61.68 mph (99.27 km/h) |
| 60 mph (96.56 km/h) | 67.29 mph (108.29 km/h) |
| 65 mph (104.61 km/h) | 72.9 mph (117.32 km/h) |
| 70 mph (112.65 km/h) | 78.51 mph (126.34 km/h) |
| 75 mph (120.7 km/h) | 84.11 mph (135.37 km/h) |
| 80 mph (128.75 km/h) | 89.72 mph (144.39 km/h) |
| 85 mph (136.79 km/h) | 95.33 mph (153.42 km/h) |
| 90 mph (144.84 km/h) | 100.94 mph (162.44 km/h) |
| 95 mph (152.89 km/h) | 106.54 mph (171.46 km/h) |
| 100 mph (160.93 km/h) | 112.15 mph (180.49 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
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