The CeramicSpeed Oversized Pulley Wheels System has been proven to be the fastest pulley system in the world, providing energy savings starting from 2.4 watts over standard Shimano systems. This features a 13-tooth upper pulley wheel and a 19-tooth lower pulley wheel to provide absolute optimization of the rear derailleur.
The Shimano 9100/8000 system is compatible up to a 32-tooth cassette for both Dura Ace & Ultegra derailleurs.
NOT compatible with: Ultegra 8000-GS or 8050-GS (medium cage) derailleurs, nor with the clutch equipped Ultegra RD RX800 & RX805. 12-speed Shimano 9200 or 8100 series derailleurs.
This product includes: complete 13-tooth/19-tooth OSPW System, CeramicSpeed Bearing Oil, (15ml. bottle).