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Old 02-02-13, 08:40 PM   #1
mikemowbz 
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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
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Old 02-02-13, 08:41 PM   #2
howsteepisit
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My late 90's mercian is a 5.5 mm hex.
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Old 02-02-13, 09:28 PM   #3
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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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Old 02-02-13, 11:21 PM   #4
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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!
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Old 03-10-13, 05:49 PM   #5
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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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