Design 2 Size


If you are a big and powerful cyclist, you need a beefier frame than a small and light rider. Makes sense, right? Still, Principia was the first manufacturer to apply this simple insight to its frame designs. Geometry, tube diameter, and thickness are tailored to match each frame size precisely. So no matter what size you are, you get exactly the right frame characteristics.


  • SX Geometry – the slope angle fits the frame size and gives you the perfect position on the bike.
  • Larger tube diameters on the big frames improve stiffness.
  • Smaller tube diameters on the small frames keep the weight down.
  • Increased tube thickness on large frames improve stiffness and stability.
  • 27,2 mm seattube increases comfort for small riders.
  • Tube angles and geometry are adapted to fit the individual frame size.


You become one with the bike. Man and machine fuse into a perfect, synchronized unit. This is how your bike should feel. What you need to make this vision come true is a frame that matches your physiology perfectly. With the D2S technology, Principia gives you precisely that: a frame that matches you.

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