Hi Roddy, and welcome to the group!

Your point is well taken. However, if the frame and fork in question
are not super-ultra-thin walled steel tubing, they probably have
enough strength to withstand the installation of canti-bosses, even if
they are not heat-treated after the brazing process. It is common for
frame builders to braze on these bosses without heat treating the
frame afterwards. The tubing is detempered in the heat-effected zone,
but the strength only goes down to ~1010 steel levels. If there is a
bit of extra meat in the areas, the frame and fork should have no
problems.

I am coming to realize that we were on the "maverick" side of things
at the Moots shop in the late 80s. We brazed first, asked questions
later. Maybe other, more cautious people on this list will temper my
reckless suggestions with more conservative viewpoints.

Mark? Any thoughts? Generally, I will defer to Mark Stonich's
expertise. I think he has significantly more frame building
experience than I do.

Yours,

Forbes Bagatelle-Black
Santa Clarita, CA


--- In Bicycle_Restoration@yahoogroups.com, "Roderick Birch"

<roddybirch@y...> wrote:
> Remember - any welding or brazing of your frame or forks will greate
> localised areas of "detempered" material and may lead in the future to
> stress fractures around the join (especially as this is a highly
> stressed part)- I have studied various methods of joining brake lugs
> onto frames and i have concluded that due to the flexion and resultant
> frame and fork deflection ... it is not a good idea. But that is my
> opinion. what is wrong with a good set of "road" brakes anyway huh -
> keep them maintained and they work fine without any of the hassle
> (which seems to accompany many of the cantilever types.
>
> Cheers Roddy