SunRace BBS 15 Square Taper Bicycle Bottom Bracket Spindle – BBS15 Review Posted by GiantPandaisy June 22, 2018 in Drivetrain Components Sealed cartridge bearings with steel cups Square taper steel spindle 338g (113mm spindle) Square taper steel spindle. Sealed cartridge bearings with steel cups. 338g (113mm spindle) Cycling Outdoor Recreation Parts & Components Sports & Outdoors SunRace