SRAM, Red FlatTop E1, Chain, Speed: 12, Links: 126, MulticolorHollowPin construction is lighter and stronger than a solid pin, and cutouts in the outer and inner plates drop 13 g from the previous generation. Flattop technology enables a narrower chain with quieter operation and increased strength and durability Hard Chrome plated inner link plates and rollers for reduced wear and prolonged life. 12 13 speed SRAM Model ID: CN RED E1