Shimano xt m8000 single narrow wide chainringshimanos xt m8000 single narrow wide chainring benefits from shimanos dynamic chain engagement dce technology which is used to hold the chain and help prevent chain jump out this is achieved with a broader and taller tooth profile used in conjunction with a special hooked leading edge this all aids holding the chain firmly on uneven terrain increases durability and keeps chain noise and drag to a minimum features hollow gear construction for