下载 APKPure App
可在安卓获取Hub Gear Calculator的历史版本
计算自行车轮毂齿轮的速度，展开等
Hub gear calculator for bicycles
* Calculate speed in Mph or Km/h at a cadence of 60 to 120rpm
* Calculate rollout in meters or inches
* Calculate gear inches
* Calculate ratio
* Comprehensive database of tyre sizes to choose from
You can input 2 different chain ring sizes for comparison.