ORIGIN 8 REVOLVR BB86/92 TO SHIMANO OS THREAD TOGETHER SB BLACKThread together bottom brackets provide a secure and stable shell interface for smoother operation and extended bearing life OS versions are designed for use in frames with worn out, oversized bottom bracket shells Hybrid AL6061 Nylon fiber cups for a superior fit and noise free operation Low friction dual seals protect the bearings from harmful contaminants Sealed premium bearings are both serviceable and replaceable Models available for both Shimano