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- Shimano Ultegra CN-6600 10-Speed Chain
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A super narrow, Ultegra chain for 10-speed drivetrains! Lighter than the 9-speed Dura-Ace chain by 24g! Contoured side plates give you the same durability and strength of a wider chain with less flex and more precise shifting Special chain connecting tool is required (TL-CN23/CN32)