Specialized Carbon OSBB Technical Info

Specialized carbon frames with OSBB bottom brackets have 61mm wide shells You must use our Wheels Mfg. PF3.5-SPC spacer kit when running non-Specialized FACT cranks with our PF30 or PF30-OUT bottom brackets.

The bearings (6806) are pressed in to composite or aluminum cups that are then pressed in to the frame's bottom bracket. While originally designed to work with BB30 cranks that have a 30mm spindle, many cranks with 24mm or 24/22mm spindle diameters can be used with PF30 frames when using adapters. To use a Shimano, FSA, SRAM or Campagnolo crank on these frames, the PF30 cups must be spaced to 68mm width. Use our Wheels Mfg. PF3.5-SPC spacer kit. In some cases it might also be necessary to use one or more additional Crank Spindle Spacers to adjust the chainline. We recommend using a Wheels Mfg PF30 bottom bracket instead of the standard Specialized BB to ensure correct chainline.

  • Shell width: 61mm (road)
  • Shell ID: 46mm
  • Uses 6806 bearings (42mm OD, 30mm ID) contained inside cups and the cups are pressed into the frame
  • The frame's bottom bracket shell will have a smooth bore (no snap ring grooves)
  • When using standard PF30 or PF30 Outboard bottom bracket, you must use the 3.5mm spacers as shown below.

Specialized Carbon OSBB Exploded View

 

Specialized Frame/Crank/Adapter Fit Chart

Specialized Alloy OSBB Compatible Cranksets Wheels Mfg Adapters
Shimano Hollowtech II (Spindle diameter = 24mm)
  • Shimano
  • 105
  • Dura-Ace
  • Ultegra
  • CX-70, CX-50
SRAM/Truvativ GXP (Spindle diameter = 24/22mm)
  • SRAM/Truvativ
  • Rival GXP
  • Red GXP
  • Quark GXP
  • Force GXP
  • Apex GXP
  • Noir XC
Campagnolo Ultra-Torque (Spindle diameter = 25mm)
  • Campagnolo
  • Super Record
  • Super Record CT
  • Record
  • Record CT
  • Chorus
  • Chorus CT
FSA MegaExo (Spindle diameter = 24mm)
  • FSA
  • Gossamer
  • K Force
  • SL-K
  • Team Issue
  • V-Drive
Rotor 3D (Spindle diameter = 24mm)
  • Rotor
  • Road Standard (130 BCD)
  • Road Compact (110 BDC)
  • Time Trial
  • Agilis Road
Race Face (Spindle diameter = 24mm)
  • Race Face
  • Decadence
Notes

Two 3.5mm spacers to convert 61mm shell to 68mm width. Install between Pressfit 30 cups and bottom bracket shell. Also includes five 0.7mm spacers to adjust the chainline on SRAM or Shimano Hollowtech II or compatible cranks. (note: the 0.7mm spacers are not used for Campagnolo crank installation)

 

SPECIALIZED OSBB FRAME IDENTIFICATION - ROAD FRAMES  
Year Family Model Bottom Bracket Type
2012 Tarmac S-Works Tarmac SL4, S-Works Tarmac SL4 Pro, Tarmac SL4 Pro Carbon OSBB shell
2012 Amira S-Works Amira SL4, S-Works Amira SL4 Pro Carbon OSBB shell
2012 Venge S-Works Venge, S-Works McLaren Venge,Venge Pro Carbon OSBB shell
2012 Shiv S-Works Shiv Carbon OSBB shell
2011-2012 Roubaix S-Works Roubaix SL3 Carbon OSBB shell
2010-2011 Tarmac S-Works SL3 Carbon OSBB shell
We'd like to keep you up-to-date.
Sign up for our newsletter and create an account to receive 15% off a future order.