Campagnolo ekar 13 speed rear derailleurbringing you the tough performance and lightning quick gear changes you need for mixed terrain riding, the ekar rear derailleur makes the most of campagnolos revolutionary 1x13 speed road gravel cyclocross ready drivetrain.all road and gravel bike ready rear derailleurthe ekar rear derailleurs revolutionary 1x13 speed specific design has been created especially for gravel and all road. The combination of more than 70 moving parts lovingly crafted in carbon fibre, techno polymers and anodised alloys, with stainless steel bolts exceed the demands of gravel and all road riding. This unique combination of materials creates a derailleur which is lightweight, strong and durable for the rigours of this category of riding. It's able to combine quick, precise and reliable shifting with high chain security and toughness.the ekar groupset has been designed for short evenly spaced shifts between gears and the 2d parallelogram trajectory of the derailleur allows for precise mechanical movement between the 13 sprockets. You can maintain your cadence, whatever terrain you are riding.features material carbon fibre reinforced polyamide anodised 7075 6082 alloy construction for light weight, strength and durability assembly bolts stainless steel bolts for strength and long term resilience mount type standard hanger type mount largest sprocket 44t smallest sprocket 9t only for use with campagnolo ekar 1x13 speed groupsets suitable for gravel and all road riding compatible with all three ekar cassette options easy to switch for gearing changes revolutionary clutch lock design for swift and easy wheel removal 2d parallelogram trajectory for precise shifting 12t upper and 14t lower jockey wheels jockey wheels made from high grade polymer for smooth chain running and secure retention manufactuer's part number cpb180a weight 275gbuy campagnolo components from chain reaction cycles, the world's largest online bike store.