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you're assuming things.
How do you know its bendy?
How can you judge the geo from this perspective?
maybe the stem is there for trial, maybe he's waiting for the deeper bars and stem the build was made for?
maybe he swapped it for one race?
Maybe he got more flexible and decided to go deeper?
If you had a bargain on a schmolke, say somebody would sell saddle for 50quid, wouldnt you put it on your bike? It is an improvement, no?
are rotor cranks such a ww component?

Please dont bother answering these questions, I am just stating the point.

No worries, I can't be arsed anyway. Fwiw - rotors are pretty heavy, but stiff (though I don't know how stiff those 'drillium' style rings are).

skinny tubing does not equal noodly ride, like alu frame does not equal stiff ride.

Ed, the properties of steel are such that thin tubing WILL equal flex, in the bb, stays and in the fork under heavy braking. You can't debate that. It's science, maths, magnets etc :)

How much flex is OK is totally up to the rider and what they want from the frame obviously. Maybe this guy figures that having really stiff cranks and wheels will compensate for flex - who knows?