On our CARBO and MARIOLA frames Front Deraileur hanger is custom made for those frames. It is brazed on seat tube, in proper angle for Front Derailleur to follow Chain Rings,regardles of Seat Tube angle,

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Mariola frame650c wheels for sizes 47-55 and 700c wheels for sizes 55-61. Choice of 76 or 78 Deg Seat Tube angle. Same proven stock sizes geometry. Custom geometry/fitting available for $200 extra. Full set of BrazeOns. Available in Red or Blue Colors.
e, Mariola Down Tube
A very sleek and narrow (only 27mm) Down Tube provides more Aero advantage than any other aero tube on the market.
On the other hand, being 60mm wide and tear drop shaped, it provides unmatched torsional resistance needed in hills or during the last few miles of hard pedaling. A thin walled horizontal Top Tube is hidden behind the head tube, providing controlled flex of the frame, in a vertical plane, resulting in a comfortable ride.
 
Mariola frameMariola has a "classic" rear end. The Double Seat Stays, ovalized to 29x14mm for aero efficiency and solid braking, are made based on our own design.
It's the same with the Chain Stays, resulting in a rigid, responsive, and yet an extremly light frame.
 
Spec 3 Just a detail of the head tube badge on this beautifully painted frame. Passion Pearl, a non-stock color - $100 Extra
Front derailleur braze on detail
 
 
Spec 4Aero seat tube is swagged down towards the seat post area in a round shape, allowing the usage of any 27.2mm seat post. Top Tube on ST joint is only 28.6mm, possible by Sc exceptional properties, like no other Al tubing on the market.