Singer seatposts vary quite a bit in diameter - it all depends on the frame and also if there is an internal sleeve in the seatube.
I think that Kalloy straight posts are probably a good start to building one - I actually have a few that need rebuilding that I'll be working on soon. Does anyone know if the Kalloy straight posts are available anywhere?
Mike Kone in Boulder CO
> Hello Craig,
>
> SiNGER seatposts diameters (with expansion bolt) from a 1949 tandem:
> Front: 25.0mm.
> Rear: 23.8mm.
> Note, Front has integrated stoker stem.
>
> You could probably have a frame builder/machinist make one for you.
>
> Hope this is useful.
>
> Regards,
> Dave Martinez
> Fremont, NorCal the 51st state
>
> Craig wrote:
> Hi, what is the seatpost dia of an Alex Singer seat post?
>
> Regards
> Craig Griffith
> San Luis Obispo, Ca.
> ----- Original Message -----
> From: Kurt Sperry
> To: Craig
> Sent: Tuesday, March 14, 2006 7:38 PM
> Subject: Re: [CR]Seat post that has an expander bolt like a stem
>
>
> They exist.
>
> Kurt Sperry
> Bellingham WA
>
>
> On 3/14/06, Craig wrote:
> Hi Gang,
>
> Here is a tough one, I got a lovely 1930's (original paint) frame
> with
> the seat lug broke at the binder bolt area. Did any one make a seat
> post
> that used an expansion bolt to tighten the seatpost rather than a
> binder
> bolt at the frame? Hopefully that makes sense. I am looking to see
> if
> they exist then locate a size.
>
> Regards
> Craig Griffith
> San Luis Obispo, Ca.
>
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