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Octolink BB's

Version 1 BB-5500 and BB-7700 and version 2 BB-ES25 and BB-ES51 Octalink are very different beasts. Don't get them confused. (Source Sheldon Brown)

Octalink ® cranks come in one of two different spline patterns:

  • The original "V1 " type for:
    • XTR (BB-M952 9-speed) 112.5 & 116 mm lengths
    • Dura-Ace (BB-7700 9speed) 109.5 mm (double) & 118.5 mm (triple) lengths
    • Ultegra (BB-6500 9-speed) 109.5 mm (double) & 118.5 mm (triple) lengths
    • 105 (BB-5500 9-speed) 109.5 mm (double) & 118.5 mm (triple) lengths
  • The later "V2" type for:
    • Deore XT (ES70/71)
    • Deore LX (ES70/71)
    • Deore (ES50/51)

      The V2 BBs work with FC M752, FC M751, FC M572, FC M571, FC M510-8 and FC M440-8 cranks.

    • Tiagra 2005 (4401,4404)
    • Sora 2005 (3301,3304)


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