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  1. #1
    Senior Member mikemowbz's Avatar
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    Odd-sized seapost binder bolt on '84 Mercian - 5.5mm or 7/32"?

    So, I was just reminded - when I went to pull the post - that the 1984 Mercian Professional I acquired early this year and just fished out of storage has an odd-sized binder. The bike has what I think I've heard described as a 'Dutch' binder configuration on the seat lug, where the seatpost binder bolt screws into a threaded 'ear'.

    The hex fitting is between a 5mm and 6mm size, and so I was wondering:

    On a British bike such as this, of the mid-1980s, would that bolt likely be a 5.5mm hex fitting, or 7/32"?

    The two measurements are very close, of course, but I wanted to see what I could find out...in the interest of precision.

    Any insight

  2. #2
    Senior Member howsteepisit's Avatar
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    My late 90's mercian is a 5.5 mm hex.
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  3. #3
    Senior Member bobbycorno's Avatar
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    My King of Mercia had the same kind of binder, and took a 7/32 allen key. I'd be amazed if an older Brit bike took ANY metric key.

    SP
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  4. #4
    Senior Member mikemowbz's Avatar
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    Quote Originally Posted by bobbycorno View Post
    My King of Mercia had the same kind of binder, and took a 7/32 allen key. I'd be amazed if an older Brit bike took ANY metric key.

    SP
    OC, OR
    Indeed, though an '84 is somewhat middlingly 'older'. I understand that metrication (seriously, it's a word) made major inroads generally in the UK in the late 1970s and early 1980s (though I have no idea to what degree this influenced the finer bike builders and their preferred bolts). In the end, I might just procure both and see which appears a better fit! I have neither on hand, unfortunately...

    How old is your KOM?
    Last edited by mikemowbz; 02-04-13 at 02:44 AM. Reason: spelling!

  5. #5
    Senior Member mikemowbz's Avatar
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    For the sake of closure, FWIW - 7/32 key works perfectly for the binder bolt in question on the '85 Pro.

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