When you cut a frame open, you expose everything.
Besides being able to see the wall thickness in different locations, one can see the surface finish internally - which is related to how well the layers of carbon are compacted together during the curing process.
When there are internal wrinkles of carbon - those plies aren't doing anything but increasing weight. On our frames, we don't use ANY filler materials or foam that stays in the frame - and our front triangles are laid up and molded together in ONE piece, instead of gluing pieces together.
This allows continuous fibers to carry the load, increasing stiffness, strength and decreasing overall weight.
It's a lot of small things that all come together, getting inside the frame allows you to see what's real - and can't be hidden behind a fancy paint job.
Cast: santa cruz bikes