Thread-together bottom brackets provide a secure and stable shell interface for smoother operation and extended bearing lifeHybrid AL6061/Nylon fiber cups for a superior fit and noise-free operationLow-friction dual seals protect the bearings from harmful contaminantsSealed premium bearings are both serviceable and replaceableDesigned for installing Shimano HTII 24mm, SRAM GXP 22/24mm, or DUB spindle cranks into BB386 frames without the need for adaptersOrigin8 Nylon composite BB tools are recommended to avoid the possibility of damaging the cups86.5/92mm x 46mmBB386/BB392SRAM DUB 28.99mmAL6061/Nylon Fiber135g