Verrry interesting there David and Chuck. I just tried the same experiment and verified the findings. All these years and I never thought to use a 1/2" wrench on that bolt! And I've seen so many with rounded points too. I slipped a Snap-On 1/2" six point socket on one, and there's no way you're going to round it off with that. It's perfect! I'll no longer use anything else.
So, I wonder if Campy actually specified the bolt at 13mm, and it just didn't turn out that way? I can't imagine they would really use a non-metric measurement. Is there anywhere in Campy's literature that actually calls it a 13mm?
The devil is in the details.
Wayne Bingham Falls Church VA
In a message dated 7/9/03 5:07:16 PM, david@worrall.co.nz writes:
<< I'm not so sure that the the seat post bolt on a Super Record post really had a 13mm head- every one I've had has been more like 1/2". The allen head bolt for the C-Record seat post part #7350162, will fit. This is not the same bolt as the the one on more common Chorus/Athena/Victory seat post, which had a coarser thread. Alternately, SRP used to make a Ti bolt, which you might be able to find. >>
David and All,
I think you are on to something! I just came back from the workshop where I measured seven (7) SR seat post (three are NIB) bolts. They ALL measured 12.8mm across the flats. I looked at my Norton International conversion chart and 12.8mm is closer to 1/2" (12.700mm) than it is to 13mm. That done, I picked out a nice 13mm craftsman box wrench as well as a 1/2" wrench and the 1/2" fits like the proverbial glove, while the 13mm is a bit sloppy!!!
I always thought the damn bolt was 13mm and never gave it a second thought until now!!
Keep it original!!!
Regards,
Chuck Brooks
Malta, NY