Accepts P-Metric and Inches
235/55-20 | 255/45-20 | Difference | |
---|---|---|---|
Diameter inches (mm) | 30.18 (766.5) | 29.04 (737.5) | -1.14 (-29) -3.8% |
Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
Circum. inches (mm) | 94.8 (2408.03) | 91.22 (2316.92) | -3.59 (-91.11) -3.8% |
Sidewall Height inches (mm) | 5.09 (129.25) | 4.52 (114.75) | -0.57 (-14.5) -11.2% |
Revolutions per mile (km) | 668.32 (415.28) | 694.6 (431.61) | 26.28 (16.33) 3.9% |
255/45-20 Tires
Speedometer Difference
Speedo Reading | Actual Speed |
---|---|
20 mph (32.19 km/h) | 19.24 mph (30.97 km/h) |
25 mph (40.23 km/h) | 24.05 mph (38.71 km/h) |
30 mph (48.28 km/h) | 28.86 mph (46.45 km/h) |
35 mph (56.33 km/h) | 33.68 mph (54.2 km/h) |
40 mph (64.37 km/h) | 38.49 mph (61.94 km/h) |
45 mph (72.42 km/h) | 43.3 mph (69.68 km/h) |
50 mph (80.47 km/h) | 48.11 mph (77.42 km/h) |
55 mph (88.51 km/h) | 52.92 mph (85.17 km/h) |
60 mph (96.56 km/h) | 57.73 mph (92.91 km/h) |
65 mph (104.61 km/h) | 62.54 mph (100.65 km/h) |
70 mph (112.65 km/h) | 67.35 mph (108.39 km/h) |
75 mph (120.7 km/h) | 72.16 mph (116.13 km/h) |
80 mph (128.75 km/h) | 76.97 mph (123.88 km/h) |
85 mph (136.79 km/h) | 81.78 mph (131.62 km/h) |
90 mph (144.84 km/h) | 86.59 mph (139.36 km/h) |
95 mph (152.89 km/h) | 91.41 mph (147.1 km/h) |
100 mph (160.93 km/h) | 96.22 mph (154.85 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 |
Better Fuel Economy Factory Ratios Increased Power