The Sram XG-1251 Cassette 12 Speed 10-44T is designed to enhance your cycling experience, offering a wide 440% gear range that ensures smooth transitions whether you're tackling steep gravel climbs or speeding along asphalt. This cassette is optimized for electronic shifting, providing fast, precise, and seamless gear changes. X-Range gearing offers an extended range and smoother gear transitions 440% range caters to the needs of 1x gravel riders Compatible with XPLR 1x rear derailleurs for optimal performance Works with Flattop chains and XDR driver bodies Mini Cluster technology ensures lightweight durability Technical Features Item name: XG-1251 Series name: XPLR Speed: 12 speed Ratio: 10-11-13-15-17-19-21-24-28-32-38-44 Color: Silver Teeth: 10-44T Sprocket material: Nickel chrome plated steel Technology: X-Range Body: XDR Group: XPLR Group comp - SRAM: XPLR Type: Mini cluster