^As much as 98% efficient under ideal conditions, according to Kidd, Matt D.; N. E. Loch, R. L. Reuben. Bicycle Chain Efficiency. The Engineering of Sport conference. Heriot Watt University. 1998 [2006-05-16]. (原始内容存档于2006-02-06).引文使用过时参数coauthors (帮助)