BlackBearing Bottom Bracket - 46 - 79 - 30 - B5Features Screw in cup design ensures optimal alignment, reducing frame stress and potential cracking. Sustainable design allows bearing replacement without removing the entire case, helping preserve the frame and reduce waste. Low friction construction improves power transfer for smoother and more efficient riding. Engineered to reduce wear, extending bearing life and minimizing maintenance. Easy bearing access enables quick and hassle free