ACER Racing 6806 2RS Ceramic Cartridge Bearing BB30 ID=30 OD=42 W=7 30x42x7mm Ceramic Ball Bearing
- Ultra high performance BB30 Ceramic Bearing for bicycles with diamond polished Ceramic Silicon Nitride Balls (the hardest and smoothest ceramic balls on the planet).
- ACERGoo 100% Synthetic American Lubricant.
- Super Smooth, Quiet, Extremely Durable and 60 day no hassle money back guarantee.