OSBB is the acronym for Specialized’s OverSized Bottom Bracket. It features a 46mm diameter and 61mm width shell. As it is unique, it requires a unique bottom bracket to mate BB30 cranks to it. 

The cups come installed with one of two CeramicSpeed bearings. The Standard Bearing has ceramic CS balls and hardened-steel races. The Coated Bearing has the same balls running on hardened-steel races with a 3-micron thick metallic coating making the races harder and smoother, increasing service life and reducing friction. 

In The Box

  • 2 cups with bearings installed.
  • 2 3mm spacers.
  • 2 1mm spacers.
  • 2 0.5mm spacers.
  • 2 dust covers.
  • Wave washer.
  • Telescoping spacer tube.
  • 10ml All Round Grease.
  • Sticker sheet.

Ceramicspeed PF4630 Coated OSBB (Specialized)

SKU : 101427
Brand / Marque
BB Type
Spindle Diameter