Direct mount retainer ring designed specifically for our RX cranksetNo need for separate spider and bolts for a lighter set-upNarrow/wide tooth profile to keep the chain where it should beSizes 38/40/42/44 toothOptimised 45mm chainlineCompatible with 9,10,11 and 12 speed set-upsCNC machined in 7075-T6 aluminium6 colour optionsHard anodised finish makes them ultra-durable and increases longevity