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whats so great about those bars?! i cant see that angling the flats can do anything other than make them very uncomfortable.

When you're on the drop, your forearms sometime get obstructed by the top part of the bar, those shape, I believe tend to eliminate such issue (it also why bar like the B123 have a long curve on the top to allowed a bit of room for the cyclists' forearm), at least that what I assumed.

Yep, for forearm clearance during out of the saddle sprints. It is also a stiffer design because the tube length is shorter, and curves down towards the drops from the stem.