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 Sealed premium bearings are serviceable 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 Origin8 Nylon composite BB tools are recommended to avoid the possibility of damaging the cups 68mm ENG BB30 Wide/BB386 30mm AL6061 120g