Re: [CR]seat post bolt question

Example: Framebuilders:Masi

Date: Wed, 9 Jul 2003 18:51:25 -0700
Subject: Re: [CR]seat post bolt question
To: "Bingham, Wayne R." <>
From: Brandon Ives <>
In-Reply-To: <>

Wayne there's no mystery here. I'm sure it's a 13mm spec bolt, but 1/2" is actually 12.7mm in metric measurements. You can use either on the other with no problem in 95% of cases. I've used both on my Campy seatpost with no problems. ciao, Brandon"monkeywrench"Ives SB, CA

On Wednesday, July 9, 2003, at 05:57 PM, Bingham, Wayne R. wrote:
> 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, 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