At 5. 5mm, Campagnolo's new 11-Speed Chain is easily Campy's narrowest chain. They call it the "Ultra Shift" chain because of its incredible shift precision. The first thing we notice when pedaling the bike is glorious silence. Less interference from adjacent sprockets and chainrings makes the 11-Speed chain quieter and quicker-shifting than Campy's previous generations of chains. It's minimal size and hollow pins mean the 11-Speed chain weighs an incredible 255g. Plus, a re-formulated outer link material and a Ni-PTFE anti-friction treatment give the new chain 20% greater longevity.