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. Features an English (BSA) threaded frame interface with an inner diameter of 1.37" Designed for use with 30mm spindles Anodized black finish Precision engineered in Fletcher, NC