What is the current cycling scene in China?

注:此文为给Sheldonbrown.com的撰稿,目的是向西方读者解释国内的单车发展状况早已不是28大横梁的年代。所有描述都为个人主观感知。进藏线路方面的资料和图片由车友老鬼提供,大南山的线路记录和坡度标记由车友老方提供,特此鸣谢... Read Full Post

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【Sheldonbrown.com译文】车胎尺寸系统

原文地址:http://sheldonbrown.com/tire-sizing.html... Read Full Post

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如何利用速比(Gain Ratio)来判断单车档位的适应性

Gain Ratio是Sheldon Brown提出的一种基于单车轮组半径、曲柄长度、牙盘与飞轮齿数的力矩转换计算方式。轮组半径/曲柄长度*牙盘齿数/飞轮齿数,表达的是骑行者双脚移动距离产生的单车移动距离。譬如GR值为5,则双脚每移动10厘米,则单车前进50厘米。之前多数算法中只考虑到了牙盘与曲柄的齿比,而且所获得的比例并无实际的含义。Sheldon的公式应该是目前最为权威的表述。在这个基础上我对自己的两辆单车以及对应的改装方案都进行了计算,并给出了飞轮换挡时速度的升幅或者力量的升幅。... Read Full Post

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Modern Cantilever Brakes for the Cyclocross

Center-pull cantilever brakes were quite popular on mountain bikes before V-brakes appeared. Generally speaking, the stopping power of cantilever brakes is less than that of V-brakes due to its structural machanics which is relatively complicated so as to lose power on frictions. While the recent prevail of cyclocross makes modern cantilever brakes revive. Relatively good stopping power and excellent allowance for muds compared with calipers on regular road bikes, along with great compatibility with road bike levers (while V-brakes incompatible), make them the best choice for cyclocross.... Read Full Post

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