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Carbon fibre immediately indicates a component's competitive spirit. So just imagine if the component in question is the very soul of the racing bike: the rear derailleur.
The carbon front link says it clearly: the Chorus™ groupset is designed for racing. Available with a short or medium cage, to interface perfectly with double and compact cranksets.

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Campagnolo The official web site: In order to see this page you are kindly asked to download the latest Flash Player 8.
You can download it from Macromedia Website.

Campagnolo The official web site: In order to see this page you are kindly asked to download the latest Flash Player 8.
You can download it from Macromedia Website.

205 g

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upper to lower pulley-axle: 72,5 mm - composite outer plate

Campagnolo The official web site: In order to see this page you are kindly asked to download the latest Flash Player 8. You can download it from Macromedia Website.		Campagnolo The official web site: In order to see this page you are kindly asked to download the latest Flash Player 8. You can download it from Macromedia Website.
forged aluminium bodies		weight savings and long fatigue life
carbon outer plate		light, long fatigue life, corrosion-proof
skeletonized upper body		greater rigidity with same weight
rollers on bushings		long life, low friction
rollers in special rubber		damping of vibrations

* The nominal weight refers to the lighter specification among the available options. The weight of the hubs does not includes the quick-release.
The nominal weight does not take account of the sometimes considerable quantities of grease used in the assembly of the products.