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-   -   Odd-sized seapost binder bolt on '84 Mercian - 5.5mm or 7/32"? (http://www.bikeforums.net/classic-vintage/870842-odd-sized-seapost-binder-bolt-84-mercian-5-5mm-7-32-a.html)

mikemowbz 02-02-13 08:40 PM

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

howsteepisit 02-02-13 08:41 PM

My late 90's mercian is a 5.5 mm hex.

bobbycorno 02-02-13 09:28 PM

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

mikemowbz 02-02-13 11:21 PM

Quote:

Originally Posted by bobbycorno (Post 15229851)
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?

mikemowbz 03-10-13 05:49 PM

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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