The Kogel Kolossos Oversized Pulley Road Cage is the best way to help your Campagnolo EPS 12-speed groupset run smoother than ever. This pulley cage greatly reduces friction and leads to faster and smoother shifts thanks to ceramic bearings. It adds a 19-tooth lower pulley to what is already the stiffest rear derailleur around, resulting in elite performance. You can count on the most accurate shifting possible with this cage. Please note that it is only compatible with Campagnolo EPS 12-speed electronic systems and does not work with 11-speed or mechanical groups. The Kogel Kolossos Oversized Pulley Cage makes an already great groupset even better.