Shimano officially launches new 11-speed Dura-Ace

Shimano Dura Ace 9000
Shimano Dura-Ace 2012, 9000 series

Japanese manufacturer Shimano has released details of its new top-end Dura-Ace groupset, which now features 11-speed components.

The groupset was first seen on a couple of the professional riders' bikes at the Giro d'Italia during May.

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