Wheels Manufacturing Pressfit 30 Bottom Bracket Wheels Manufacturing's new Pressfit 30 Bottom Bracket features all of the same benefits as the company's well-loved original PF30 BBs. The two machined aluminum cups thread together ensuring the bottom bracket remains stable in the frame, which increases bearing life, and simplifies maintenance. This means no more creaking, smoother operation, longer bearing life, and really quick bearing replacement. Note: Use only bottom bracket tools compatible with 16-notch, 48. 5mm outer diameter cups Wheels Manufacturing Pressfit 30 Bottom Bracket Specifications: Bearings: Enduro ABEC-3 6806 BB shell width: 61mm, 68mm, 73mm BB/frame interface: PF30 Bottom bracket shell I. D. : 46 Spindle interface type: BB30/PF30 Weight: 114 grams | Wheels Manufacturing | Pf30 To Bb30 Bb Blk, Pf30 To Bb30, Enduro Ac Bearings