The Ekar rear derailleur’s all new 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 adonised 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 is able to combine quick precise and reliable shifting with high chain security and toughness. Please ensure you have a 13x compatible wheelset to be use this product 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. Technology Revolutionary Clutch Lock design: for swift and easy wheel removal 2D parallelogram trajectory: for precise shifting 12T upper and 14T lower jockey wheels both constructed in high grade polymer: for smooth chain running and secure retention. Specification Only for use with Ekar 1x13 speed groupsets Suitable for Gravel and All-Road riding Carbon fibre reinforced Polyamide and anodised 7075/6082 alloy construction: for light weight strength and durability Stainless Steel Bolts: for strength and long-term resilience Compatible with all three Ekar cassette options - easy to switch for gearing changes Weight: 275g