Cane Creek Hellbender 70 30th Anniversary Bottom Bracket - English For 30mm Spindles BlueCane Creek Hellbender 70 30th Anniversary Bottom Bracket English For 30mm Spindles Blue. The Hellbender 70 bottom bracket utilizes bearings made of 440C stainless steel providing exceptional ride quality and reliability while striking a perfect balance between value and lasting performance. Marine grade grease and robust bearing seals complete the package in terms of durability. 440C stainless steel bearings with a dual lip seal and marine grease