Build a 12-speed Di2 Time Trial / Triathlon bike
Building a 12-speed Di2 Time Trial (TT) or Triathlon bike isn't as straightforward as you might think. What components can you use, and how do you connect them?
Time Trial/Triathlon Dual Control Lever
DURA-ACE ST-9071
Each shifter has two buttons, and they're not 12-speed compatible. If you want to build a 12-speed time trial bike, please read the building a 12-speed TT bike guide.
These shifters are compatible with carbon fiber handlebars (but only with aluminum inserts where the brake levers are installed) or aluminum handlebars. The handle inner diameter is 19.0 – 22.5mm.
Specifications
- Model code: ST-9071
- Series: DURA-ACE (9070)
- Weight: 64g (per lever)
- Speeds: 10 / 11
- Number of switches: 2
- SD50 ports: 1
- Reach adjust: Yes
- Brake type: Rim
Related components
View all componentsRelated pages
Installing the handlebar junction and battery in aero extensions
I installed SW-7972 Dura-Ace satellite shifters on my 6870 commuter bike by doing some cutting and soldering, as well as some creative wiring.
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!
3.2.0
Additional function for ANT- D-FLY Channel switch setting for cycle computer
3.1.0
Firmware updated
3.0.1
Update accompanied with SW-S705
3.0.0
Adjust compatibility
2.2.0
Improving usability of data uploading
2.1.0
Improved stablility of unit communicationEnhancement of energy-saving
2.0.2
Firmware updated