This is the hope single downhill chainring 104mm bcd hopes new aluminium chain rings allow the perfect set up with single speed 1 x9 and 1 x 10 drivetrains and when using a chain guide cnc machined 7075 t6 aluminium provides the perfect blend of light weight and strength a hard anodised finish makes these ultra durable and increases longevity available in 104mm pcd 4 bolt pattern and in 32t 34t 36t 38t and 40t sizes finished in black gold or silver