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  1. #1
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    newb bb question

    hey folks,

    I have a late 70s Nishiki International that I have converted into a single speed. I have removed the the older crank and replaced it with a used shimano 600 and noticed that the shimano crank sits further out on the 68 x 127 mm BB spindle. This distance is 9.5 mm between the crankarm and the BB cup. I have respaced the rear axle as well as redished the wheel in order to establish a straight chainline but am not so happy with the "look", In my eyes the drive train seems to sit outboard just a bit more than I would like.

    I'm thinking about replacing the loose bearing BB with a sealed unit, which leads to my question. If I were to choose a 68x110, x113, x115, would this reduced width alow for the shimano crank to recess nearer the BB while considering clearance for the crank arms along the chainstay? If so, I assume that I would once again need to respace the rear axle.

  2. #2
    MADE IN HONG KONG
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    I have a 70's Nishiki mariner that I have converted to SS and now FG. The crank was replaced with a Shimano 600, the rear wheel has been replaced with 700 and a Phil Wood track hub (120). Currently, I am using a UN-72 68 X 115 and the chain line looks great. There is very little room (2mm?) between the crank spider and the chain stay. In the past, I used a shorter BB spindle, but had to use spacers to push the whole BB to the right in order to clear the crank with the chain stay.

    For your rear wheel, you will very likely need to re-dish if you change BB's. please note asymmetry or lack off in the BB spindle.
    If you are not having any fun, it's all your fault

  3. #3
    Last one to the top... Little Darwin's Avatar
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    Edit... Please ignore... I reread the original post which answered my question for me...
    Slow Ride Cyclists of NEPA

    People do not seem to realize that their opinion of the world is also a confession of character.
    - Ralph Waldo Emerson

  4. #4
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    Thanks cow.

    I stoped by my campus bike shop and discussed the issue further. We are going to try a 68x118 and if we see that the spider can move inboard a bit more then we'll move a size down. I'll be droping the bike off tomorrow and have the install done while I'm in class. I have found that while I enjoy working on my own machines, The cost of specialized tools for BBs sometimes makes some work best left in the hands of the pros.
    Last edited by quattro7703; 04-19-06 at 10:18 AM. Reason: additional info

  5. #5
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    the 118 BB worked fine and all looks good.

  6. #6
    Yet another vegan biker
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    I just replaced the old Tange loose-ball BB and Sugino cranks on my 77 Fuji tourer with a Campy Veloce BB and crankset. AWESOME change.

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