It's pretty hard to up the ante on SRAM's excellent Eaglegroupset, but if you're looking for every possible advantage on race day,CeramicSpeed allows you to hot rod your stock rear derailleur with preciseshifting, supremely durable, and smoother spinning jockey wheels. These14-tooth replacement pulleys easily install into your existing Eagle derailleurand provide a claimed 34. 4% improved efficiency with its unique narrow-widedesign and of course, those famous spinning CeramicSpeed bearings. Update tosome SRAM Eagle 12 Speed Aluminum Pulley Wheels today and go that much quickeron race day. The Eagle 14 Pulley Wheels are hand assembled in Denmark anddesigned to replicate the narrow-wide 14 tooth top and bottom pulleys that comestock on the derailleur so shifting is just as precise as stock. Durablematerials ensure longer life over stock and CeramicSpeed specs a stainlesssteel bearing race for higher corrosion resistance and more durability in thedirtier riding conditions you're more likely to face while riding off-road.