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With the M8000, Shimano has completely renewed its outstanding XT group and, as with the XTR, relies on an 11-speed drive that scores with an incredibly wide range of applications.The teeth of the SM-CRM81 single chainrings are equipped with Shimano's new Dynamic Chain Engagement (DCE) technology and provide optimum chain guidance - both in terms of guidance during crank rotation and chain retention on the chainring in rough terrain. The danger of a chain jumping down is thus further minimised. In addition, the design of the chainrings with steel and carbon-reinforced plastic takes into account the forces and loads occurring in each case and thus guarantees a long service life.