The Hope Retainer Chainring has a narrow/wide tooth configuration designed for 1x10 and 1x11 set-ups without the need of a chain guide. The Hope Retainer Chainring is CNC machined out of 7075-T6 aluminium, providing the perfect blend of weight vs strength. Hope Retainer Chainring Features Quieter drivetrain and less drag Compatible with 9spd, 10spd and 11spd set-ups Hard anodised finish makes them ultra durable and increases longevity Available in our 6 standard colours and Gold Weight from: 41g 104 BCD 4 Bolt Pattern Fitment Available in 30T,32T,34T,36T and 38T options