Some bikes with slanting top tubes are measured as if there were a level top tube, they use the length that the seat tube would be if it was as high as the head tube.
而有些上管倾斜的车架，会被当作水平上管的车架来测量。 立管长度就会从中轴中心量到立管上与头管一样高的位置。
Some bikes with slanting top tubes are measured as if there were a level top tube, they use the length that the seat tube would be if it was as high as the head tube.
而有些上管倾斜的车架，会被当作水平上管的车架来测量。 立管长度就会从中轴中心量到立管上与头管一样高的位置。
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