The Easton Spider and Ring assembly features the Cinch Direct Mount System, making a swap between ring configurations a fast and simple procedure. This system also provides a significant weight savings by eliminating the material overlap and extra bolt hardware that is required for a traditional spider with chainring configuration. Features: EA90 Aluminum 53/39t Specs: Drivetrain Speeds11 Chainring BCDDirect Mount CINCH ColorBlack Defined ColorBlack MaterialAl/Carbon