. The new Retainer Ring is designed to work without the need for a chain guide (with the use of a Clutch style rear mech). No need for heavy chainguides, noisy drivetrain & drag. CNC machined 7075-T6 aluminium provides the perfect blend of light weight & strength. The chainring is compatible with 9spd, 10spd & 11spd set ups. A hard anodised finish makes these ultra durable & increases longevity. Available in 104mm PCD, 4 bolt fitting. Specification: Available as a 30t, 32t, 34t & 36t Chainring size 104 PCD 4 bolt pattern No need to run chain device Designed to work with conventional 9, 10 or 11spd set ups Weight from 41g Buy Hope Retainer Narrow Wide Chainring from Chain Reaction Cycles, the World's Largest Online Bike Store.