ROLLCii external T47 style bottom brackets are made in Taiwan from 6061-T6 aluminum and feature high-quality stainless steel or ceramic bearings, where available. We offer four different bearing sizes to help you fit your favorite crank to your favorite bike.

Note: Installing 30mm and 29mm spindle T47 bottom bracket parts requires the ROLLCii T47 12T wrench, which is not included with the bottom bracket parts.