Wheels MFG

PressFit 30 to Shimano Bottom Bracket with Angular Contact Bearings

This is meant for bikes that use a 24mm spindle crank (Shimano Hollowtech II) in a PF30 frame without the use of adaptors. Enduro ACB (angular contact bearings) are an improvement over radial bearings as every ball is in contact with the races during load. This spreads the force of pedaling across a larger surface area which in turn decreases friction and helps minimize wear. Dual lip groove seals made of silicone help keep water and other contaminants out. 

• Manufacturer Part Number: PF30-OUT-3
• Made in the USA
• Silicone seals
• Black cups

For more info look here on Wheels Mfg's site.