Optimized for 7-12 speed drivetrains, these chainrings provide smooth shifting across various gear ranges. Make from aluminum Alloys, these chainrings a balances of strength and light weight designs. Features a narrow wide tooth designs for efficient chain retention and reduced frictions during ride. Designs with a 3mm offset for improved chainline and balanced power transfer, reducing chain slap. Smooth appearance, and excellent resistance. It is excellent replacement part for Bicycles repairs.