Developed and designed entirely by CeramicSpeed the Oversized Pulley Wheel System for Campagnolo is advanced for the optimization of bike performance. The 13-tooth/19-tooth OSPW for Campagnolo provides a 40% lower friction over a standard 11-tooth Campagnolo pulley wheel and fits up to a 32-tooth cassette. Features: Grade 3 Silicon Nitride balls Hardened races Reinforced polyamide cage and non-contact seals Hand built in Denmark Carbon fiber cage Alloy pulley wheels Specifications: Compatibility: Campagnolo Record, Record EPS, Super Record, Super Record EPS, Potenza, Chorus Speeds: 11 Speed Max Cog: 32T Color: Black