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Specialized Alloy OSBB

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SPECIALIZED ALLOY OSBB TECHNICAL INFO

Specilaized Alloy OSBB frames use the BB30 bottom bracket system, consisting of a 68mm (road) or 73mm (mtb) wide shell and a 30mm diameter crank spindle. The frame's bottom bracket shell itself is not threaded, instead the bearings press directly into the frame. BB30 frame shell inner diameter is 42mm, has two bearing retaining clips and two 6806 bearings pressed directly in the shell. The BB30 system uses thin spacers and/or a wave washer between the bearings and the crank arms to take up any slack and micro-adjust the chainline of the crank.

  • Shell width: 68mm (road) or 73mm (mountain)
  • Shell inner diameter (ID): 42mm
  • Two 6806 bearings (42mm OD, 30mm ID) pressed directly in frame and stop at removable snap rings
  • Accepts 30mm spindle cranks
  • Accepts 24mm and 22/24mm cranks with separate adapters

 

 


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
  • BBUNIV-SHIM
  • BB30-SHIM
SRAM/Truvativ GXP (Spindle diameter = 24/22mm)
  • SRAM/Truvativ
  • Rival GXP
  • Red GXP
  • Quark GXP
  • Force GXP
  • Apex GXP
  • Noir XC
  • BBUNIV-SRAM
  • BB30-SRAM
Campagnolo Ultra-Torque (Spindle diameter = 25mm)
  • Campagnolo
  • Super Record
  • Super Record CT
  • Record
  • Record CT
  • Chorus
  • Chorus CT
  • BB30-CAMP
FSA MegaExo (Spindle diameter = 24mm)
  • FSA
  • Gossamer
  • K Force
  • SL-K
  • Team Issue
  • V-Drive
  • BBUNIV-SHIM
  • BB30-SHIM
Rotor 3D (Spindle diameter = 24mm)
  • Rotor
  • Road Standard (130 BCD)
  • Road Compact (110 BDC)
  • Time Trial
  • Agilis Road
  • BBUNIV-SHIM
  • BB30-SHIM
Race Face (Spindle diameter = 24mm)
  • Race Face
  • Decadence
  • BBUNIV-SHIM
  • BB30-SHIM

 

SPECIALIZED OSBB FRAME IDENTIFICATION - ROAD FRAMES  
Year Family Model Bottom Bracket Type
2012 Tarmac Tarmac SL3, Tarmac Elite, Tarmac Comp Alloy OSBB shell
2012 Venge Venge Expert Alloy OSBB shell
2012 Amira Amira Elite, Amira Comp Alloy OSBB shell
2012 Shiv S-Works Shiv Pro, Shiv Expert, Shiv Comp Alloy OSBB shell
2012 Ruby Ruby Pro Alloy OSBB shell
2012 Allez Allez Evo, Allez Comp Alloy OSBB shell
2010-2011 Amira S-Works Alloy OSBB shell
2011 Tarmac SL3 Pro Alloy OSBB shell
2007-2010 Tarmac All carbon models with OSBB shell Alloy OSBB shell
2011-2012 Roubaix SL3 Pro Alloy OSBB shell
2007-2010 Roubaix All carbon models with OSBB shell Alloy OSBB shell
2007-2011 Ruby All carbon models with OSBB shell Alloy OSBB shell
2012 CruX Crux Expert, Crux Comp Alloy OSBB shell
2007-2010 Tricross All carbon models with OSBB shell Alloy OSBB shell
2008-2011 Transition All carbon models with OSBB shell Alloy OSBB shell

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