^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 (帮助)
^In the 16th century, Leonardo da Vinci made sketches of what appears to be the first steel chain. These chains were probably designed to transmit pulling, not wrapping, power because they consist only of plates and pins and have metal fittings. However, da Vinci's sketch does show a roller bearing.Tsubakimoto Chain Co. (编). The Complete Guide to Chain. Kogyo Chosaki Publishing Co., Ltd. 1997: 240 [2006-05-17]. ISBN0-9658932-0-0. p. 211.