Features: Optimized for 7-12 speed drivetrains, these chainrings provide smooth shifting across various gear ranges. Make from aluminum Alloys, these chainrings offer a balance of strength and light weight design. Features a narrow wide tooth design 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 corrosion resistance. It is excellent replacement part for Bicycles repairs. Specifications: Materials: Aluminum Alloys Number of teeth: 30T/32T/34T/36T/38T(Optional) Diameter: about 19cm/7.48inch Offset value: 3mm/0.12inch Compatibility: 7-12 speed Package Includes: 1pc Mountain Bike Chainwheel note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.