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  1. #1
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    campy square taper cranks,, what bb do i use

    i just picked up a 1990's campy crankset. it says it is square taper. does this require a special campy BB?
    my existing cranks are from the same era they are mirage gruppo. i bough these to switch from triple to double.

  2. #2
    sch
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    Something like this would do, but you would have to match threading to
    your BB shell. The one listed is Italian thread. Shimano and other Japanese
    Sq tapers have a slightly different spec to the taper so it is worthwhile to
    use Campy, especially as the price is pretty benign.
    http://aebike.com/page.cfm?PageID=30...ils&sku=CR9655

  3. #3
    hello roadfix's Avatar
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    Usually most any Campy square taper BB for double cranksets would work. Your current BB spindle would be too long as it was designed for a triple crankset.

  4. #4
    me have long head tube TallRider's Avatar
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    Campy square-taper cranks and bottom brackets use the ISO interface - most others (including Shimano) use the JIS interface, which has the same taper angle of 4 degrees but is slightly thicker. You can mix them in practice, but it ain't close to ideal.

    Note that the square-taper interface is different than the threading of the bottom bracket.

    Different cranks get proper chainline with different bottom bracket spindle lengths. It's worth trying to figure out what bottom bracket spindle length is ideal for your crankset.

  5. #5
    Aluminium Crusader :-)
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    I used to put all my '90s Campag cranks on square Shimano BBs, and it worked ok, but
    now all the cranks are 'stretched' and go on way too far on a Campag square spindle (the cranks easily hit the cups). I was going to sell some of them, but now they're a bit knackered

    also, the Campag cranks with the auto extract bolt need checking more often on a Shimano BB
    (I guess because they just don't go on far enough), especially after the first few rides

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