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  1. #1
    Jersey Boy Yeah ieandro's Avatar
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    Converting from square taper to Octalink

    Hi guys,

    I have an older Trek 1000 that I would like to rebuild into my foul weather bike. It originally had a Bontrager triple crank with a square taper BB (English). I am looking to upgrade to the 9 speed Ultegra 6500 series double crank and BB.

    The original square taper BB (UN54) had a spindle length of 113.
    I was browsing through some websites and have seen two lengths - 109.5 and 118.5. Are they for double and triple cranks respectively? Did I just answer my own question?
    What are the differences between the V1 and V2 versions? The V1 seems to have more sizes which leads to my confusion.

    Thanks!
    Jersey Native

  2. #2
    Senior Member
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    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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    Quote Originally Posted by ieandro View Post
    The original square taper BB (UN54) had a spindle length of 113.
    I was browsing through some websites and have seen two lengths - 109.5 and 118.5. Are they for double and triple cranks respectively? Did I just answer my own question?
    What are the differences between the V1 and V2 versions? The V1 seems to have more sizes which leads to my confusion.

    Thanks!
    The 109.5 is for double and the 118.5 is for triple cranks as you surmised.

    The V1 is the road Octalink for 105, Ultegra, etc. cranks. The V2 is the MTB Octalink for Deore LX, etc. The V2 splines are longer and wider and the two types are not interchangable.

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