The 5 bolt 110mm bcd retainer ring from hope has been designed with a narrowwide tooth configuration designed to work with 1x10 and 1 x 11 set ups without the need of a chain guide made from cnc machined 7075 t6 aluminium which provides the perfect blend of lightweight and strength it also gives a quiter drivetrain with less drag and the hard anodised finish makes it ultra durable and increases longevity it is also compatible with conventional 9 10 and 11 speed set ups available in 38 40