Dave Zabriskie’s Felt DA

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US national champion Dave Zabriskie's bike is not easy to miss with its distinctive stars and stripes design. His DA was debuted at the Giro d'italia this year and has seen some improvements over the previous design. Felt has taken technology to the next level by using computational fluid dynamics (CFD) software and designing each part of the frame separately before joining the frame together with further CFD software, with the final step being wind tunnel testing.

The head tube has been narrowed with the help of a new 3/4in steerer tube and bearing, with the bayonet taking over the structural functions of the head tube. Small aerodynamic wings on the seat tube act to ‘trip' air flowing over the rear wheel and a small trip on the seatpost steers air away from the Di2 groupset's battery, positioned just below the saddle.

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Founded in 1891, Cycling Weekly and its team of expert journalists brings cyclists in-depth reviews, extensive coverage of both professional and domestic racing, as well as fitness advice and 'brew a cuppa and put your feet up' features. Cycling Weekly serves its audience across a range of platforms, from good old-fashioned print to online journalism, and video.