SRAM Force E1 Thread Mount 2x Chainring Kit Designed as part of the Force AXS groupset, the Thread Mount 2x chainrings are part of an innovative system to minimize weight while maximizing stiffness and power meter accuracy. Quickly swap ring sizes with an easy-to-use tool. Model ID: CR-FRC-TMKT-E1 Features Thread Mount design is light, stiff, and accurate Available in 46/33, 48/35, and 50/37 chainring combos Compatible with all road Flattop chains SRAM Thread Mount Chainring Removal Tool is required for installation Specifications Chainring Size 46/33T, 48/35T, 50/37T Bolt Circle Diameter (BCD) Thread Mount Speeds 12 Compat - Yaw n/a Material (Chainring) Aluminum Color (Chainring) Black Chainring Offset 0mm Chain Technology Road Flattop D1, Road Flattop E1 Drivetrain Configuration 2x Chainring Mount Interface DM 8-Bolt