The RD-R7150 Di2 is the first electronic rear derailleur from the Shimano 105 series. Due to its generous total capacity of 41 teeth, you can shift 12-speed cassettes with a largest sprocket of 34 to 36 teeth,
which is also a novelty in road cycling. The compact unit, which only weighs about 40 grams more than the Ultegra model due to its high aluminium content, contains a lot of high-tech features:
the wireless unit for wireless communication with the STIs, the charging port, which you can use to easily recharge your shifters and derailleurs with the help of the matching charging cable, and a function button.
You can use it to adjust the rear derailleur, check the battery status, change the shift mode from manual to Synchro and Semi-Synchro Shift or establish a Bluetooth connection to a bike computer or smartphone.
An LED display helps you to do this. The rear derailleur is connected to the battery via a cable, from which a cable also runs to the front derailleur. It impresses with its fast,
precise shifting processes as well as with its Flat Shadow design, which optimises the shifting behaviour and prevents damage.
