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General description SRAM Chainring Road Red22 39T is designed for 11-speed systems, featuring X-Glide R technology for smooth and efficient shifting. This chainring is made from durable aluminum and comes in a sleek black finish, making it a stylish and functional addition to your road bike. Technical specifications Size: 39T Speed: 11 Speed Material: Aluminum Finish: Blast Black Compatibility: 130mm BCD (Bolt Circle Diameter) Weight: 3mm thickness