CroMo steel with webbed tubing matrix

it's a matrix.
thats webbed
and tube shaped.

I'm guessing they are referring to the chain stay to BB.
a lot of modern builds have a cast web there, not something that is easy to do in steel (pish easy in ali though). I suspect they have designed a version that can be made in Steel where by they've linked across the stays with tubes. think crane structure.

Gusset and web aren't the same thing, a gusset is between to pieces that meet at an angle, web joins two pieces that don't meet (sort of, 2 bits that meet eventual can be webbed and gusseted).
 
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