I have heard they tend to project bottles, however...
CA
I've got this and I've never lost a bottle yet (knock on wood). But, it would look a bit silly on your mixte. I think you'd be best with the handlebar mount.
I'd rather be swimming...biking...running...and eating cheesecake...
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2008 Cervelo P2C Tri bike
2011 Trek Madone 5.5/Cobb V-Flow Max 2007 Jamis Coda/Terry Liberator
2011 Trek Mamba 29er