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The Shimano STR M980 10 Speed HGX Chain is an industry-first mountain bike specific chain specifically optimized for 10-speed Dyna-Sys drive trains with mud-shedding, task-specific link plates. Featuring an off-road specific design, advanced pin riveting technology which yields the same strength as 9 speed chains, directionally optimized with task-specific plates and hollow-pin technology. Weighs 259 grams.