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  1. #1
    cheap transportation
    Join Date
    Sep 2008
    Location
    San Diego
    My Bikes
    '84 Motobecane Jubilee Sport, ~93 Trek 800
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    Bottom Bracket spindle width question

    So I've got a road double on my 1999 Gunnar. Its a Shimano FC-5500. This should be inboard cartridge type bearings with a 109.5mm spindle right?

    Supposedly my bike came with a 118.5mm spindle and a triple. The extra 9mm should be for the extra chain right right?

    I just wondered whether the spindle width varied with anything other than the number of chainrings.

    I was also thinking of converting to outboard bearing style bottom bracket and wondered if the spindle width was important in this style of BB.

    Thanks in advance if you can help
    2012 Allez OSBB, Ultegra

    2010 Transition Covert

  2. #2
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''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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    For Octalink (the 5500 is) cranks doubles require the 109.5 and triples require the 118.5 mm spindle. For outboard bearring cranks (5600, etc) the spindle is built into the crank arms and you have no choice to make.

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