The EX1 derailleur relies on the robustness and precision of construction of the X-HORIZON™ to create the world's first derailleur specifically designed for electric mountain bikes. Designed to handle gear changes at low cadence and high torque on the 11-48 tooth E-BLOCK™ cassette, the EX1 derailleur provides electric mountain bike riders with clean and safe shifts, allowing them to spend more time enjoying their ride. The proven SRAM X-HORIZON™ design reduces the force required for shifting, minimizes unintentional gear changes, and prevents chain noise. X-SYNC™ rollers with 14 teeth The EX1 derailleur is specially designed for electric mountain bikes. CABLE PULL RATIO: 1:1 SPEED: 8-speed COLOUR: Black CAGE MATERIAL: Aluminum BEARING ROLLER: Steel MAX TOOTH COUNT: 48T WEIGHT: 285g