Understanding Di2 derailleur specifications
Shimano front derailleur and rear derailleur specifications... what do they mean, really? This page explains all of them, and why they matter.
Short Cage Shadow Rear Derailleur
DURA-ACE RD-R9150-SS
The Shimano DURA-ACE Shadow Rear Derailleur is an 11-speed derailleur that features synchronized shift and a low-profile (Shadow) rear derailleur design.
Affiliate Links
Using the affiliate links to purchase anything earns the site a small commission, at no additional cost to you.
It allows for ergonomic shifting operation without stress, race endurance for less damage in crash and maintains compact and smooth appearance.
The short cage total capacity is 33 teeth, with a low sprocket range of 30T-25T and a top sprocket range of 14T-11T. The max front difference is 16 teeth.
Specifications
- Model code: RD-R9150-SS
- Series: DURA-ACE (R9150)
- Weight: 197g
- SD50 ports: 1
- Max front difference: 16T
- Total capacity: 33T
- Low sprocket max: 30T
- Low sprocket min: 25T
- Top sprocket min: 11T
- Top sprocket max: 14T
- Pulley teeth: 11
- RD type: Shadow RD
- Clutch: No
Related components
View all componentsRelated pages
Micro-adjust your 10-speed and 11-speed road bike Di2 rear derailleur
Indexing, trimming, or fine-tuning Di2 rear derailleurs is done through micro-adjustment. Read how to set up your Di2 rear derailleur perfectly and ride without those grinding noises.
Installation Guide: 10-speed and 11-speed Di2 road 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.
Change your Di2 lever free stroke and reach
Do you have small hands? Or extra large hands? Read this page to figure out how to change your Shimano Di2 shift lever (or shifter) reach.
Di2 Synchro shift – how does it work?
Current and previous Shimano Di2 road, mtb and gravel (grx) groupsets feature Synchronized Shifting. Learn what it is, how to set it up and tweak it.
Manuals & other documents
Firmware updates
Below is an overview of all known firmware updates for this component. The changelog texts are Shimano's, and quite often they're a bit cryptic - sorry!
3.3.0
Added a function to adjust the correct rear derailleur position under the maintenance tab.
3.2.1
-Added interchangeability between SHIMANO STEPS with Road components.- Adopted models （RD-R8050-SS/RD-R8050-GS/RD-RX805/RD-RX815）
3.1.3
・Adopted for Gravel/Adventure Road Bike rear derailleur, RD-RX805・Bug fixing
3.1.1
Firmware updated
3.0.3
Firmware uploaded