Origin8's Revolvr BB386 Outboard Bottom Bracket features forged and CNC-machined AL6061 thread-in cups for a superior fit and noise-free operation. Low-friction dual seals protect the bearings from harmful contaminants, while sealed premium bearings are both serviceable and replaceable. - Designed for installing BB30 Wide or BB386 30mm spindle cranks into BSA threaded frames - For use with 30mm diameter cranks with a spindle length of at least 104mm - Shell: 68mm x 33.6-33.9mm - Interface: ISO/English or BSA Threaded (1.37" x 24TPI) - Spindle Type: BB30 Wide/BB386 30mm - Cup Material: AL6061 - Weight: 120g