The Campagnolo Chorus 12 Speed chain was engineered specifically for the 12-Speed road groupset, which given the tight physical space requirements of a 12-speed cassette, meant that the 5.15mm chain needed to be slim, robust, smooth and precise in all facets to perform at the ultimate level required by a 2x12 drivetrain ridden by the world's top pro cyclists in the most extreme conditions.

A chain, in all its apparent simplicity, plays a critical role in the cyclist's safety and in optimizing the entire drivetrain system. As all the components involved are specific to 12-speed, and the tolerances incredibly tight, the chain has to integrate and function perfectly. Therefore, the first and most important objective was reducing its overall dimensions. As the width is now 5.15 millimeters, having exacting standards and materials were required to create new pins, which are perfectly aligned with the outer plates of the links resulting in a impeccably flush surface

The second objective for Campagnolo's engineers was safeguarding both performance and safety. This was achieved thanks to the Ultra-Link system that makes the chain safe and durable, and a special treatment that guarantees extreme smoothness and precision shifting. The incredibly quick shifting 12-speed drivetrain isn't all down to less space between cogs, but to the precision components that make-up the drivetrain of the bicycle, and the incredible chain that makes it all function perfectly.

Campagnolo also requires use of their UT-CN300 Chain Tool, which is not only needed to break chains properly, but also to drive and peen the pin precisely. This exacting process becomes even more crucial with flush pin design of the 5.15mm chain. The UT-CN300 Chain Tool is a specially designed, ultra precise, tapered tip end the driving pin on the tool. In fact, Campagnolo claims that if this drive pin is at all damaged it should be immediately replaced with the UT-CN301 Spare Pin. Needless to say your Campagnolo 12-Speed chain will come with highly specific instructions, and if for some reason you don't have them, Campagnolo has the PDF on their website. If you do not have the correct tool and specific experience, take your bike and chain/pin to you nearest Campagnolo Service Center or trusted mechanic for installation.