Principia’s flagship aluminium model with incredible stiffness and low weight that transforms all your power to speed. Principia Diet Process takes weight off the frame without compromising stiffness and stability, and in combination with the Ellipse Project technology, this makes Rex one of the fastest bikes in its class. Available in Jet Black Anodized  as frameset only including Principia Full Monocoque Carbon fork and integrated Principia headset.

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