規格/系列：RF2040S、RF2040R、RF2050S、RF2050R、RF2060S、RF2060R、RF2080S、RF2080R、RF2100S、RF2100R、RF2120S、RF2120R、RF2160S、RF2160R

◆ 滾子鏈的節距增加1倍、鍊板形狀採用直板型，帶附件的輸送鏈，為雙倍節距鏈的專用鏈輪。
◆ S滾子·R滾子可與現有大部份的器材相容，不用特別加工鏈輪。