Wheels Manufacturing BB30 To Shimano BB Use this adapter to convert your BB30 frame to a Shimano bottom bracket using high quality Enduro bearings. This adaptor will allow you to run your Shimano Hollowtech II 24mm crankset directly within the BB30 frame. This adapter includes a CNC-machined aluminum shell, and replaceable Enduro bearingss for the ultimate in creak-free smoothness. Wheels Manufacturing BB30 To Shimano BB Specifications: BB shell width: 68 mm, 73 mm BB/frame interface: BB30 (please note: not compatible with PF30 frames. PF30 requires a different adaptor. ) Spindle interface type: 24mm spindle (Shimano Hollowtech II, FSA Mega Exo, Race Face EXI) Weight: 153 grams | Wheels Manufacturing | Bb30 To Shimano Bb Bb30 To Shimano With Abec-3 Bearings