Shimano 105 celebrates its 40th anniversary with a major technological leap, the introduction of the Di2 R7100 Series. This marks the first time the 105 groupset features semi-wireless electronic shifting, offering precise gear changes, enhanced system reliability, and reduced maintenance demands. Built on the same Di2 platform as Dura-Ace and Ultegra, the R7100 delivers pro-level performance at a more attainable price point, staying true to 105s legacy of bringing advanced road technology to a wider range of riders.Included in this groupset : Shimano 105 Di2 R7170 Shifters/LeversShimano 105 Hydraulic Calipers (front and rear)Shimano 105 Di2 R7150 12-Speed Rear Derailleur Shimano 105 Di2 R7150 12-Speed Front Derailleur (braze on)Shimano 105 Di2 R7100 12-Speed Chainset 50/34T (cranks 172.5mm)Shimano 105 Di2 R7101 12-Speed Cassette 11-34TShimano 105/SLX M7100 12-Speed Chain 126L Di2 DN300 Internal Battery EWEC300 Charging Cable 1700mmE-tube Di2 SD300 1000mmE-tube Di2 SD300 1200mmShimano