Precision machined AL6061 cups for a superior fit and noise-free operation Low-friction dual seals protect the bearings from harmful contaminants Sealed dual-row premium flanged bearings Designed for installing BB30 Wide, BB386, BB392, and other 30mm spindle cranks into BB86/92 frames* *For use with 30mm diameter cranks with a spindle length of at least 104mm 86-92mm x 41mm BB86/BB92 BB30 Wide/BB386 30mm AL6061 80g