Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-20 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.33 (719.5) | 29.04 (737.5) | 0.71 (18) 2.5% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 88.99 (2260.38) | 91.22 (2316.92) | 2.23 (56.55) 2.5% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 4.52 (114.75) | 0.35 (9) 8.5% |
| Revolutions per mile (km) | 711.98 (442.4) | 694.6 (431.61) | -17.38 (-10.8) -2.4% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.5 mph (32.99 km/h) |
| 25 mph (40.23 km/h) | 25.63 mph (41.24 km/h) |
| 30 mph (48.28 km/h) | 30.75 mph (49.49 km/h) |
| 35 mph (56.33 km/h) | 35.88 mph (57.74 km/h) |
| 40 mph (64.37 km/h) | 41 mph (65.98 km/h) |
| 45 mph (72.42 km/h) | 46.13 mph (74.23 km/h) |
| 50 mph (80.47 km/h) | 51.25 mph (82.48 km/h) |
| 55 mph (88.51 km/h) | 56.38 mph (90.73 km/h) |
| 60 mph (96.56 km/h) | 61.5 mph (98.98 km/h) |
| 65 mph (104.61 km/h) | 66.63 mph (107.22 km/h) |
| 70 mph (112.65 km/h) | 71.75 mph (115.47 km/h) |
| 75 mph (120.7 km/h) | 76.88 mph (123.72 km/h) |
| 80 mph (128.75 km/h) | 82 mph (131.97 km/h) |
| 85 mph (136.79 km/h) | 87.13 mph (140.22 km/h) |
| 90 mph (144.84 km/h) | 92.25 mph (148.46 km/h) |
| 95 mph (152.89 km/h) | 97.38 mph (156.71 km/h) |
| 100 mph (160.93 km/h) | 102.5 mph (164.96 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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