The Shimano SM-BBR60 is a bottom bracket type BSA or ITA, which is recommended for Ultegra, 105 and other 24 mm Hollowtech II cranks. It convinces with improved smooth running and low weight, but is just as durable as its predecessor. Bottom bracket housings with BSA threads are 68 mm wide, ITA housings are 70 mm wide.
14 g lighter than previous SM-BB6700
Smoother than previous SM-BB6700 (50% less friction)