The Shimano ST-R8170 Bracket Cover Pair is a set of replacement rubber hoods (grip covers) for Shimano’s Ultegra R8100 series hydraulic Di2 road shifters.
Shimano ST-R8170 Bracket Cover Pair (Ultegra R8100)
What it is
This is:
- a pair of rubber lever hoods (left + right covers)
- for Shimano ST-R8170 hydraulic Di2 shifters
- part of the Ultegra R8100 road groupset
Shimano’s official term is “bracket cover”, but most riders call them hoods.
What they do
These covers:
- provide grip on the brake/shift levers
- protect the internal lever mechanism
- improve comfort during long rides
- seal the lever body from dirt and moisture
Compatibility
Specifically designed for:
- ST-R8170 (Ultegra Di2 hydraulic levers)
They are not interchangeable with:
- ST-R8050 / ST-R8070 (older Di2)
- mechanical 105/Ultegra hoods
- other Shimano road lever generations (each shape is unique)
Shimano hood shapes are very model-specific, even within the same groupset family.
Key characteristics
- OEM Shimano replacement part (Y0NS98010)
- Soft-touch rubber compound
- Textured grip pattern for wet conditions
- Tight fit for vibration-free control
- Sold as a pair (left + right)
When you replace them
You typically replace bracket covers when:
- rubber becomes sticky or worn
- tears develop from crashes or bar tape removal
- grip texture is smoothed out
- you want refreshed cockpit feel
Installation note
- They fit tightly over the lever body
- Usually installed by rolling/stretching into place
- Often easier with light soapy water or silicone spray
Bottom line
The Shimano ST-R8170 bracket cover pair is a precision-fit replacement hood set for Ultegra R8100 Di2 hydraulic levers, restoring grip, comfort, and protection to your brake/shift levers while maintaining Shimano’s factory cockpit feel.
