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  1. #1
    Junior Member
    Join Date
    Jan 2008
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    Kingsville, TX
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    2 Cannondales and a Motobecane frameset
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    basic ? about a French bottom bracket

    I have a Motobecane frameset which has the fixed cup/adjustable cups installed but that's all--with the 35x1 French threading. So do I have to shop around to find compatible "French" axle, bearings, etc. or will some generic components work? I am planning to use it with two chain rings, as an around town road bike. Thanks for any advice. George
    Earlier I posted this in the mechanics section and someone suggested I also ask here. It's a Super Mirage that had a stem mounted shifter--probably from the 70s or 80s.

  2. #2
    Senior Member sykerocker's Avatar
    Join Date
    Dec 2005
    Location
    Montpelier, VA
    My Bikes
    The keepers: 1960 Raleigh Lenton Grand Prix, 1968 Ranger, 1969 Magneet Sprint, 1971 Gitane Tour de France, 1973 Raleigh Tourist, 1973 Lambert, 1973 Schwinn Super Sport, 2 - 1988 Rossins
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    The easiest solution is to use the original French cups. Bearings are no big deal, the good old standard loose balls will work just fine. To this add a '5' (Italian) dimensioned spindle, since French cups are usually a bit thinner. Now, you can probably do all the math on chainlines, etc., to figure out the proper spindle length, but it's still an arcane science, so the easiest solution is to pick up a couple of different used spindles and just try them to find which one fits the best for your planned crank.

    If you're planning on using a French crank (say, Stronglight), it might be a bit more direct to find an actual Stronglight, etc. spindle in the proper size. On my end, the local LUsedBS sells me spindles at $1.00 apiece, so I just have a collection of them on the shelf.
    Syke

    "No wonder we keep testing positive in their bicycle races. Everyone looks like they're full of testosterone when they're surrounded by Frenchmen." ---Argus Hamilton

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