The question is, did you all of a sudden find yourself riding down the road with the bars disconnected from the stem and then crash, or did you crash because of some other reason, and then saw the bars had broken?
If its the first situation, then yes, you likely have a claim against Bianchi. In the second situation no.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1