C-Bear Ceramic Bearings PF30 (PressFit 46 mm) Bottom Bracket for Shimano cranks with 24 mm spindle.

C-Bear Ceramic Bearings is a Belgian bearing specialist for ceramic ball bearings with excellent running properties and durability. All bottom brackets work without additional spacers and washers.

The race bottom bracket offers minimum rolling resistance for dry road conditions.
 
The housings are made of aluminum and offer higher stiffness and precision compared to plastic, more stability and no tendencies to deform.
The bearings lie close to the crank arm and ensure optimum stiffness and maximum force transmission.
No additional parts such as spacers, adapter or shaft rings required.