Campagnolo EKAR Rear Derailleur Campagnolo's new Ekar rear derailleur was engineered using Campagnolo's industry leading experience and technology. The Ekar derailleur is designed to be used in conjunction with the new Ekar 1x13-speed groupset and has been optimized specifically for use on gravel surfaces. A single rear derailleur design means that you can easily swap between any of the available three cassette options without having to change your derailleur. Its pulley wheels feature differentiating tooth-counts (12T upper, 14T lower) which improves chain retention and overall drivetrain fluidity. The carbon fiber reinforced polyamide and anodized 7075 and 6082 alloys make up the derailleur's body and pulley cage. This blend of carbon fiber and various alloys produces an extremely durable derailleur exterior as well as keeping the overall derailleur weight low. The clutch system built into the derailleur keeps the chain properly tensioned while riding over rough terrain and is easy to disengage while removing the rear wheel. Stainless steel bolts are included for increased longevity. /p>Features Designed for Ekar which means that this derailleur has been optimized to handle a 13-speed drivetrain Carbon fiber and alloy blend makes the derailleur body and pulley cage lightweight while also increasing the overall durability of the derailleur Clutch mechanism keeps the chain tensioned properly while also allowing for easy wheel removal Differentiating pulley wheel tooth counts improves the drivetrain efficiency and chain retention Stainless steel bolts improve the longevity of the derailleur and are resistant to corrosion | Campagnolo | Ekar Rear Derailleur | Black | Long Cage, 13-Speed