John T.Pergolizzi wrote:
> What makes this frame so special and unique is the addition of
> internal oval reinforcing tubes in the down tube, seat tube and chain
> stays! These internal oval reinforcing tubes are about 6 inches long,
> run from the bottom bracket out, and were installed originally to
> stiffen the bottom bracket area as the owner was a tall powerful
> sprinter.
>
> When I discovered the magic hidden in this frame during bottom
> bracket repacking, I called a few frame builders and asked about this
> special treatment. Sachs said he had heard of it, but never seen it.
> Baylis also had never seen this treatment before.
Columbus did this with their "Aero" down tubes back in the on-topic era, but it was a teardrop-profile tube with a round insert.
--
John (john@os2.dhs.org)
Appleton WI USA