For BSA frames with 73 mm case width and SRAM DUB cranks with 28.99 mm axle.
Threaded MTB bottom brackets are mostly English-threaded, aka BSA, and feature the same threading and the same 34 mm inner diameter, but a wider 73 mm shell. This kit pairs 28.99 mm SRAM DUB spindle cranks to the BSA MTB standard.
Bearings pressed into threaded cups, which are then threaded into the frame are the main components of this kit. Super smooth, super round CeramicSpeed balls are rotating in hardened-steel races in both. In CeramicSpeed coated bearings the steel races are coated with an extremely thin (2-3 microns) protective layer, which is 75% harder than hardened steel. This metallic coating laid onto the races, making it even smoother and harder, resulting in longer life and lower drag.