• Dura-Ace made a sealed NJS square taper BB, they are quite hard to find. I have one on my beater... Hold up I'll try to find a photo.

    "**Pictured below, the 7610 bottom bracket is the match for Shimano's previous generation track crank: the 7600 series with traditional square spindle tapers. Available in English or Italian threading (the English one is Keirin approved), it has a symmetrical 109 mm. spindle and sealed cartridge bearings"

    **Link: http://www.businesscycles.com/tbb-shim.htm

    And the taper is...?

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