Shimano xt m8000 single 11 speed chainsetride anywhere 11 speed crankset with various chainring options various choices for bike and riding style more durable chainwheel teeth new 3d composite chainrings teeth composition is optimized for each chainwheel load out with steel driving gear teeth and aluminium support gears improved driving rigidity loose ratio gear combination for minimum shifting gap and maintaining rhythm enhanced chain retention better sealing and better rotation please