SHIMANO Shimano Front Mech Dura Ace Di2 R9150 11spd braze, Black

The new Dura Ace from Shimano is the answer to the question of many professionals and ambitious amateurs whether and how the current, already immensely high level of performance could increase even further. Every single Dura Ace R9150 component is designed to work efficiently with all other components of the system. This shows the core of Shimano's philosophy of components developed as a system particularly clear. The result is called System Supremacy - the superiority of the system over the sum of the individual parts. The Dura Ace Di2 front derailleur comes with a basic design change, multiple options in pulling guidance and an integrated adjustment of the tensile stress. The low-profile design ensures a slim look while improving the ability to survive damage in case of falls. SEIS SHIMANO ELECTRONIC INTELLIGENT SYSTEMA technologically innovative, computerised switching system based on the DI2 concept with the designation SEIS (SHIMANO ELECTRONIC INTELLIGENT SYSTEM). The innovative switching technology of the SEIS is based on the SHIMANO Index System (SIS), whose superior switching performance has proven itself over many years. The main difference between the systems is that the switching process is no longer mechanical, but electronically. This electronic shift system has been extensively tested in recent years by several professional cyclists under all conceivable conditions, e.g. in rain, mud, extreme cold, on cobblestones and also when combined with these factors. The switching process is done by simply pressing a button. No effort is required to shift, which brings significant advantages, as the rider always has a firm grip on the handlebars and can concentrate on driving without being distracted by shifting