1The sole gear ratio on a single-speed bicycle.
2US a gear system on a single-speed bicycle which has the rear sprocket fixed to the rear wheel, such that the pedals are always engaged.
Late 19th century.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。