High Quality Material: Made of AL7075-T6 aluminum, CNC machined and anodized for a smooth surface, bright color, fade resistance, and corrosion resistance. Elliptical Design: Eliminates trampling dead spots, increases leverage distance for optimal starting power, reduces chain skipping, improves efficiency, and enhances speed with smooth, quiet performance. Knee Protection: The chainring helps distribute pedaling force more evenly, providing better protection for the knee meniscus and reducing knee strain during climbing and long-distance rides. Compatibility: Designed for 14/16/20-inch folding bicycles. 45T/47T suitable for 14-inch bikes; 16-inch folding bikes typically use chainrings under 53T; 20-inch folding bikes require chainrings under 56T. Specifications: - Speed: 45T, 47T, 53T, 56T, 58T - Color: Red, Gold, Silver, Black - BCD: 130mm - Diameter: 45T-192mm; 47T-200mm; 53T-224mm; 56T-235mm; 58T-245mm Material: AL7075-T6 aluminum Package Includes: 1 x Bike Chainring Note: Chain length may need to be extended when installing a larger chainring. When selecting a larger chainring, ensure the diameter is within an appropriate range; otherwise, a longer axle may be required.