Seatpost bolt and BB help

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  • Morning all,

    I've never built up an older bike before, but i've just got a Concorde Aquila SLX. I've managed to free the stuck seatpost with Scale-X, but the seatpost bolt itself is missing.

    Measuring the outer distance of the two lugs, it comes up at 22.4mm. Where the bolt sits is a little recess, so do i need a 22mm seat post bolt, or a 19mm, or something else?

    Also, the BB shell is 70mm wide and has an internal diameter of 35mm, give or take. This is a Chinese vernier gauge i'm using so, you know, it could me slightly out.

    If i'm to fit the 105/Ultegra stuff in the parts bin, do i need the Shimano Hollowtech BB with Italian thread?

    Thanks in advance.

  • Seatpost bolts have quite long nuts so they fit a wide range of seat lugs widths. Such as:­intage-style-steel-seat-post-binder-bolt­-16mm/

    Also, it sounds like your Italian frame has an Italian threaded BB shell (70 x 36mm) so yes, you’ll need a BB with Italian threads.

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Seatpost bolt and BB help

Posted by Avatar for TheD245 @TheD245