Jan, Early Santana tandems used stems with an old Japanese/US quill diameter of .833" or 21.15mm, a thicker walled steerer with the same 24 x 1 threads on the outside. The stems on the earliest bikes were Japanese, either SR or Nitto. Listmember Mark Ritz worked for Santana in their early days, he may have a good comment on this.
David Feldman
Vancouver, WA
> Good point, Curt. I am sure there are ways to make a
> good tandem with
> non-OS headset and non-OS tubing. But it seems
> easier to do it with
> oversized components.
>
> For tandems in the CR timeline, the use of oversize
> headsets and
> tubing diameters is a first indicator of quality and
> good ride
> characteristics, unlike some rather difficult to
> manage tandems made
> from single-bike componentry. A test ride,
> especially by a captain
> with some tandeming experience, usually will show
> deficiencies rather
> quickly. Ask the stoker to wiggle their arms
> sideways, and see what
> happens. On a good tandem, nothing...
>
> Didn't Santana also provide, free of charge, a steel
> pipe to be
> inserted into the steerer tube of their
> non-OS-headset tandems, to
> hold things together in case the steerer/fork crown
> joint failed? I
> remember Bill McCready (sp?) writing something to
> that effect a few
> years back on the tandem list...
>
> Finally, what kinds of stems did Santana use with
> their
> extra-thickwall 1" steerer tubes? (This was before
> Aheadsets, I
> assume.) The Jack Taylors use standard 22.2 mm
> stems, and OS headsets
> - the wall thickness of the steerer tube makes up
> the difference...
> --
> Jan Heine, Seattle
> Editor/Publisher
> Vintage Bicycle Quarterly
> http://www.mindspring.com/
>
> >Jan Heine posted-
> >So a single-bike fork (non-OS headset) on a tandem
> >> should be viewed with suspicion.
> >
> >I agree that a fork built for single bike used on a
> tandem is not wise but
> >steerer diameter is not the only criteria to
> determine the fork's
> >suitability for tandem use. One inch steerers have
> been successfully used
> >for a long time but extra thick tubes are needed.
> Within CR timelines,
> >Santana built hundreds of tandems with 1" steerers
> without problems. With
> >that said, if I was to start building tandems again
> an oversized steerer
> >(28.6mm) makes sense now because 1" tandem specific
> steerers aren't readily
> >available.
> >
> >Curt Goodrich
> >Minneapolis, MN
>
>
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