The engine of the 11-speed drivetrain is the chain. It has been designed to eliminate all friction with the sprockets adjacent to those in operation. A special treatment ensures smoothness. We have reduced the width of the chain to 5.5 millimetres with the new spacing and a new material has been envisaged for the outer links. The pins are hollow inside to reduce the weight while maintaining strength. It is necessary to use tool ut-cn300 to fit it. The ni-ptfe treatment ensures smoothness and long life. The ultra-link fastening system guarantees strength and operation with the new 11-speed sprockets. Width 5,5 mm - ni-ptfe finish - 114 links - requires ultra-link for 11s chain - lightened links - hollow pins - 11s outer link - new material for outer link.