Campagnolo's new 11 Speed Chain is narrow. At 5. 5mm, it's easily the narrowest chain that Campy makes. They call it the Ultra Shift chain because of its incredible shift precision. The first thing you'll notice when you start to pedal the bike is glorious silence. Less interference from adjacent sprockets and chainrings make the 11 Speed chain quieter and quicker shifting than Campy's previous generations of chains. Its minimal size and hollow pins mean the 11 Speed chain weighs an incredible 245g. Plus, a re formulated outer link material and a Ni PTFE anti friction treatment give the new chain 20% greater longevity. Please note: installation of the new Ultra Link chain requires the use of Campagnolo's UT CN300 chain tool. It's expensive, but it's necessary for the precise installation of the narrow chain.