40 years after the inception of Shimano 105, it has finally gotten its upgrade to electronic performance. Shimano 105 Di2 is fast and efficient while remaining as affordable as you would expect from a 105 groupset. The rear derailleur is the driving force behind the entire system, communicating with the shift lever to provide lightning fast gear changes. It features a charging port along with LED indicators to keep you up to date on the status of your system. A low profile design reduces contact on falls or bumps, keeping it safe from damage. The Shimano 105 Di2 Rear Derailleur is a key component to your new electronic groupset.
