Shimano CN-HG701 11 Speed Chain with Quick Link size-s-36-39 and use the quick release

and use the quick release to loosen

FeaturesMega9 - Super Narrow Hyperglide (HG) chainRecommended for current Ultegra

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and warm enough to fight off temperatures that hover above freezing

Shimano CN-HG701 11 Speed Chain with Quick Link size-s-36-39 and use the quick releaseAbout Shimano CN HG701 11 Speed Chain with Quick LinkThe HG701 11 chain is directional and features SIL TEC treatment on the roller link plate and pin link plate for increased durability. It is compatible with 11 speed road, MTB, and E BIKES thanks to its reinforced design. FeaturesSmooth and reliable shifting performance Directional 11 speed chain More efficient and silent, less maintenance SIL TEC surface treatment MTB, Road, E BIKE 11 speed