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
Ultegra ST-6871
The TT/Triathlon Dual Control Levers ST-6871 allow the rider to change gears and operate the brakes when using the TT/Triathlon extensions.
Each shifter has two buttons, and they're not 12-speed compatible.
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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 and the handle outer diameter is 22.2 – 24.0mm.
Note that carbon fiber handlebars without aluminum inserts (where the brake levers are installed), cannot be used.
Specifications
- Model code: ST-6871
- Series: Ultegra (6870)
- Weight: 74g (per lever)
- Speeds: 10 / 11
- Number of switches: 2
- Wire length: 450mm
- Connector: SD50
- Mount: 19.0mm - 22.5mm
- Reach adjust: Yes
- Brake type: Rim
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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.
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
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