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.
Short Cage Rear Deraileur (10 speed)
Ultegra RD-6770-SS
This RD-6770 rear derailleur is a 10-speed rear derailleur and as such it isn't really used anymore. All current and previous Di2 generations have moved on to 11-speed and 12-speed.
Its low sprocket max is 28T and the top sprocket min is 11T. The max supported front difference is 16T and its total capacity is 33T.
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Has your RD-6770 broken? You cannot just replace that with an 11-speed model - all installed derailleurs must be the same speed.
Read more on upgrading your bike and compatibility on the pages linked below.
Specifications
- Model code
- RD-6770-SS
- Series
- Ultegra 6770
- Weight
- 270g
- SD50 ports
- 1
- RD Type
- Non-shadow RD
- Clutch
- No
- Max front difference
- 16T
- Low sprocket max
- 28T
- Total capacity
- 33T
- Low sprocket min
- 23T
- Top sprocket min
- 11T
- Top sprocket max
- 12T
- Pulley teeth
- 11
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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.
Understanding Di2 derailleur specifications
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.