There must be many factors, one should suspect the bike industry in the first place.
The cycling teams looking to limit the amount of material and compatibility, etc...
But,
Technically, and based on facts and science, if you have a rider measuring 162cm and 63cm saddle to BB height (short legs!!):
What's the best TT bike option ?
A 700c XS or XXS (Argon 18 E-117 or Liv Avow for example) bike ?
Or a 650c TT bike ?
Let's discuss advantages, drawbacks, etc... in an open way

Louis
