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  1. #1
    Are you with me Flash's Avatar
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    Wish to keep my Sugino Alp crank for fixed, will it work?

    Hello, long story short my Panasonic is on the stand awaiting fixed conversion. I had thought of building this up as a road double, but it seems almost perfect for a fixed gear build. I had it built up as a SS, it was fun, but this frame seems ideal for fixed conversion, so:

    I'm quite attached to the original Sugino Alp crank. It is a 170mm crank and the 42t ring is installed on the inside. As you see below, there is max 3mm space between the inside of the chain and the chainstay.

    Questions:

    1. The original bb is 117.5 ("3K") spindle. I took the bb apart to check specs and clean today, then reassembled to check chainline. I installed the slightly shorter spindle (32mm) on the drive side to get the ring closer inside. Eyeballing with ruler, chainline looks to be between 43.5 and 45. Looking at the 3mm clearance between inside of chain and chainstay, I wonder if I'm close enough. I'd like to keep this bb for the conversion. If I go with a formula flip flop hub on the original Araya 700c wheel, what is the expected chainline range in the back considering rear spacing of 126mm?

    2. If the original 117.5 spindle is judged to be too long, and I want to replace only the spindle and bearings, it looks like 113 mm spindle would bring me 1.5 mm closer in (30.5mm, see pic, green circle, below). Sound good?

    2. I know 165mm crank length is recommend on fixed due to potential pedal strike. I ride 172.5 mm on regular road. As stated I want to keep the Alp crank, which is 170mm center of bb spindle to center of pedal mount. Will 5mm make that much of a difference on mostly flat road rides with this fixie?

    Thanks! (pic of bike below is SS mode):

    bottom bracket table from sheldonbrown.com







    ---------------------------------
    must...teach...lesson.

  2. #2
    motovation frankenmike's Avatar
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    Jan 2007
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    Seems like it should work. For chainline issues, sometimes some spacers (wide hole washers from the home center) between the crank and the ring is all it takes (and is cheaper than a new spindle).

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