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Why tri bars should be unsafe? You have control of the steering, control of the brakes and your back is flat which increases comfort. Aerodynamically speaking your cross section is quite smaller.

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Your control is greatly reduced in aerobars, but more importantly, your ability to defend your space is hugely reduced, which makes riding in a pack extremely dangerous. This video explains why having the ability to protect your bars prevents crashes: https://www.youtube.com/watch?v=sRIsWzrMmBs

Cycling has some dumb rules (e.g. sock length), but banning aerobars in mass start races is not among them.

This. Aero bars are nice for flats and descents. I wouldn't want to have to do a tough climb without drop bars or at least flat bars. And I definitely wouldn't want to ride in a pack with drop bars with my hands not on them. That sounds like a great way to wreck.

When you are on the the aero-bars your hands are not on the brakes and the your ability to perform accurate steering adjustments is greatly compromised.

There is a good answer to this question here:

https://bicycles.stackexchange.com/questions/10231/why-dont-...

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