THE 11-SPEED CHORUS REAR DERAILLEUR HAS A PARALLELOGRAM OF NEW DESIGN WITH AN OVERSIZE CARBON FIBRE OUTER PLATE. The use of light alloy and composite reduces the weight while maintaining absolute operating precision. The dimensioning precision has eliminated any possible play between the parts right from the beginning. This is the fulcrum of the 11-speed systems. The 11-speed rear derailleur has a forged aluminium upper body which works on an enveloping and oversized carbon fibre outer plate. The new form confers torsional rigidity which is 150% greater than the old design and contributes to the construction of a parallelogram with absolute operating precision. The cage pulleys are now made of a lighter material and reduce vibrations
