
Index Rear Derailleurs and set Front Derailleur limits using E-Tube Project
Learn how to set up your di2 front derailleur electrical limits and index or micro-adjust your di2 rear derailleur using E-Tube Project 4.

Shimano's DURA-ACE RD-9070 rear derailleur is available in the short cage version only. Its top sprocket max is 14T, the min top sprocket size is 11T.
The low sprocket max is 28T and the min is 23T. It has a max front difference of 16T.
When paired with 9070 / 6870 or newer components and the BT-DN110 battery, this derailleur supports synchronized shift.

Learn how to set up your di2 front derailleur electrical limits and index or micro-adjust your di2 rear derailleur using E-Tube Project 4.

Micro-adjust your 10-speed and 11-speed road bike Di2 rear derailleur.

Bought a new Di2 rear derailleur and need some help installing it? Read how to install the RD-R8050 / RD-R9150 / RD-6870 / RD-9070 Di2 rear derailleurs.

What is a rear derailleur's total capacity, really? Why is there a top sprocket minimum? And what about front derailleurs? Chain line, total capacity, Top gear teeth? This page explains all of those, and more.