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  • Confused re bottom bracket 'drop' on website (Sanderson)
  • Woody
    Free Member

    Can someone please explain this to me as I’m struggling with the bb drop aspect. What does it mean and how is it measured?

    Full page with spec. HERE

    Frame Geometry
    Fork lgth Head angle BB Drop
    440mm 71 degree 25mm
    460mm 70 degree 17.5mm
    480mm 69 degree 10.5mm
    500mm 68 degree 3.5mm

    Posted 11 years ago
    pearlbaz
    Free Member

    http://www.bikecad.ca/bb_drop

    Posted 11 years ago
    thisisnotaspoon
    Free Member

    It’s the BB height measured from the dropouts, makes more sense on frame only geometry tables as obviously 1″ tyres are going to lower the BB by 2″ compared to 3″ tyres (in an extreme case).

    So assuming a 13″ wheel radius (about a 2″ tyre), -25mm BB drop would be a 12″ bb height.

    Posted 11 years ago
    Woody
    Free Member

    Cheers. Obvious when you think about it 😳

    Posted 11 years ago
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