3 Speed Front Derailleur can't reach small gear I bought a new frame and put my old Campagnolo Racing T components on it.
The seat tube has a diameter of 35mm and I use the Campagnolo 35mm clamp for the Racing T derailleur.

The problem is the derailleur can't push the chain to the small gear because a part of the derailleur touches the seat tube.  

Is the frame incompatible with a 3 speed crank or do I just need a compatible derailleur for frames with a wider seat tube, maybe the ATHENA Tripple?

Parts


Frame: BULLS Desert Falcon, Seat Tube 35mm
Crank: Campagnolo Athena 11s
Derailleur: Campagnolo Racing T
Bottom Bracket: Campagnolo BB90 Power Torque


Images:


Derailleur touching the frame: 
Crank:
The chainwheel does not sit at the correct chain line is the answer.

The most common cause is that you have an axle length shorter/longer than the ideal chain line. In this case, you have a shorter axle length.

Did you add another chainring into your crankset? If the answer is yes, you will need to tweak around: either adding spacer (not recommended) or find a compatible front derailleurs (better get to the LBS for trial/error fitting).
If the answer is no, then it will be the frame that cause you the problems, albeit unlikely. I always solve this problems by finding a correct axle length for my crankset.

You can refer to this article for more information, from Lord Sheldon.
http://www.sheldonbrown.com/chainline.html