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| Principia was the first manufacturer to guide the cables directly through the head tube giving the frame an elegant and aerodynamic appearance. | The unique and proprietary gear dropout combines the precision and rigidity of an integrated dropout with replaceability. | The latest generation of Principia’s acclaimed aluminium frames set new quality standards. With the new generation of Tube Inserted Welding 2 (TIW2), Principia’s frames are welded on both the inside and the outside. TIW2 gives extreme durability around the welds and the durability is enhanced even further by conical and triple butted tubes. The newly developed Principia Magnum Aluminium (PMA) alloy ensures that a high level of comfort is maintained. | A diameter that changes from 1,5’’ at the bottom bearing to 1 1/8’’ at the top bearing gives stiffness, strength and durability where you most need it. |