浅析自行车中轴及五通规格

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发布时间 : 2025-08-12

 随着自行车的不断发展,自行车上不断涌现着各式各样的中轴标准,让不少车友眼花缭乱,最近呢,我也遇到了一些对中轴标准了解地云里雾里的车友,那么今天,我来给大家仔细梳理一下自行车的中轴标准以及其相互之间的兼容性。

首先,我们必须要知道的一件事,就是牙盘装在车架的五通(什么是五通?五通就是和牙盘盘片所在平面垂直的那根很窄的管子)里,中轴相当于一个转换接口,让车架和牙盘能按我们期望的方式传递我们的能量。所以,中轴,不仅关乎牙盘,更关乎车架。

首先声明,本文谈到的五通,都是相对常见的五通,特殊规格的,请车主自行查阅相关资料。

然后我来补充下Qfactor这个基础知识,Qfactor,简称QF,国内有玩家称之为Q值,这个值是值牙盘左右两曲柄外缘之间的距离。在比赛中,更小的Qfactor可以有利于选手的发力,以及减小迎风面积,在一定程度上减小风阻。

那么接着我们来说一下车架上的五通的标准:

螺纹英规BSA,这是最传统的五通标准之一,其螺纹特点为一正一反,左边为正螺纹,右边为反螺纹,左侧顺时针旋紧,右侧逆时针旋紧。其螺纹外径为34.798mm,牙距为1.37*24TPI。此种五通规格在大家的公路与山地车架上最为常见,五通的宽度大多为68与73mm(此种五通宽度在DH车种上会更长,不过本文暂不讨论)。如果你想知道你的五通宽度,最简单的办法就是拿尺子量一量,这个非常简单,普通的直尺即可。

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