The Shimano Ultegra ST‑R8160 TT brake sets are part of Shimano’s 12-speed Di2 groupset, built specifically for time trial and triathlon use. This model combines the clean, aerodynamic aesthetics of Shimano’s latest designs with precision engineering that supports fast, confident braking under extreme performance conditions. This guide explores the installation, adjustment, maintenance, and optimization of the Ultegra ST‑R8160 TT, while also detailing its compatibility and comparative features.
Tools Required
- 5mm and 4mm hex wrenches
- Shimano Di2 E-Tube Project-compatible PC or smartphone
- Shimano bleed kit (for hydraulic brake servicing)
- Torque wrench with Newton-meter (Nm) settings
- Flathead screwdriver
- Brake pad spacer tool
- Clean microfiber cloth and isopropyl alcohol
Design Overview and Functionality
The Ultegra ST‑R8160 TT is a dual control lever designed for both braking and shifting when paired with Shimano’s Di2 system. Unlike traditional road shifters, these are optimized for flat, aerodynamic bar extensions used in time trials and triathlons. The ST‑R8160 is hydraulically actuated, offering consistent stopping power with minimal hand input. Internally routed Di2 wiring keeps the profile sleek, reducing drag and improving cable management.
The levers support full integration with Shimano’s 12-speed Di2 platform, enabling intuitive gear changes through electronic buttons instead of mechanical paddles. This allows for precise, programmable shifting logic that can be customized using Shimano’s E-Tube software.
Installation Procedure
Proper installation of the Ultegra ST‑R8160 TT requires careful attention to bar routing and Di2 integration. Begin by measuring your aero [paid link] extensions to ensure compatibility. The ST‑R8160 is designed for standard internal routing diameters, so confirm your bars allow for cable passage.
First, mount each lever onto the aero bar extensions using the provided clamp and torque to the manufacturer’s recommended setting of 5–6 Nm. The Di2 wires must be routed internally through the bars and connected to the junction box, typically positioned at the handlebar or stem interface.
Next, connect the hydraulic brake hoses and cut to fit using Shimano’s specific hydraulic hose cutters. Insert the barbed insert and connect the hoses to the ST‑R8160 body using the supplied olive and connector. Torque all hydraulic connections to 5 Nm. Follow with a full brake bleed using Shimano’s hydraulic mineral oil and bleeding kit to ensure firm, responsive braking.
Adjustment Guidelines
To adjust brake reach and bite point, use a 2mm hex wrench to turn the reach adjustment screw located on the inside of the lever body. Riders with smaller hands or aggressive TT setups often require minimal reach for faster response.
Brake pad clearance and rotor alignment are crucial to avoid disc rub. Center the calipers during installation and confirm with a test spin. Use Shimano’s plastic pad spacer when adjusting the calipers to maintain proper alignment.
For Di2 shifting customization, connect the levers via USB or Bluetooth to the E-Tube Project software. Customize shift button functions, multi-shift parameters, and sync shift logic. Firmware updates should also be performed through this interface.
Maintenance Schedule and Best Practices
To maintain optimal performance, inspect the hydraulic system every three to six months, particularly after events or travel. Check for any fluid weeping or loss of lever feel, which could indicate air in the line or a compromised connection. Re-bleed the system if lever response feels spongy or inconsistent.
Di2 connectors should be kept clean and dry. Periodically check for secure connections, especially at the junction box. Shimano recommends recharging the battery at least once every three months, even if not depleted.
Brake pads and rotors should be cleaned with isopropyl alcohol and replaced once pad thickness is below 1mm. Always bed in new pads and rotors to ensure proper performance.
Troubleshooting Common Set-Up Issues
A common issue during installation is incomplete Di2 functionality, often due to misrouted wires or unrecognized junctions. Use the E-Tube app’s diagnostic mode to identify missing components in the network.
Brake drag is typically the result of misaligned calipers or improperly bled systems. Loosening the caliper mounting bolts, squeezing the lever, and re-torquing with the wheel installed often resolves this. Ensure no hydraulic hose kinks exist within the aero extensions, as this can restrict fluid flow.
Sticky levers can indicate contamination inside the pivot mechanism. Clean thoroughly with isopropyl alcohol and apply a drop of Shimano-approved grease to the pivot. Avoid over-lubrication as it may attract dirt.
Customization and Performance Optimization
The Ultegra ST‑R8160 TT allows customization beyond simple lever positioning. Within the E-Tube app, shift patterns can be tailored for synchronized or semi-synchronized shifting, ideal for TT riders who prefer minimal input during efforts.
Pairing with satellite sprint shifters on the base bar expands usability in technical courses. You can also program specific buttons to shift front or rear derailleurs, depending on individual preference.
Riders can benefit from setting up two user profiles—one for training and one for racing. This ensures shifts and responsiveness are optimized for varying terrains and intensity.
Compatibility with Other Drivetrain Components
The ST‑R8160 TT levers are fully compatible with Shimano’s 12-speed Di2 derailleurs (RD-R8150 and FD-R8150), battery (BT-DN300), and junction system (EW-JC302 or EW-RS910). Only use EW-SD300 wiring standard for connection.
Hydraulic caliper compatibility includes BR-R8170 and other Shimano flat-mount designs. Rotor sizes of 140mm or 160mm are both supported, depending on frame clearance and rider weight.
It’s not compatible with older 11-speed Di2 components due to protocol and wiring differences. Using mixed-generation parts will result in shifting errors or complete system failure.
Comparison with Similar Models
When comparing the Ultegra ST‑R8160 TT to the Dura-Ace ST‑R9180 TT, the biggest differences are weight and construction materials. The Ultegra version uses slightly heavier aluminum versus the carbon composite used in Dura-Ace.
Functionally, both offer identical Di2 performance, but Dura-Ace provides a marginal stiffness benefit and lighter feel—attributes sought by professional riders. However, the Ultegra model offers nearly the same functionality at a considerably lower price point, making it ideal for competitive age-group triathletes and amateur time trialists.
Compared to mechanical options like the Shimano ST-R8060, the ST‑R8160 offers superior programmability, cleaner cable management, and more reliable braking under stress, making it the better option for high-performance applications.
Frequently Asked Questions
1. Can the Ultegra ST‑R8160 TT be used with mechanical drivetrains?
No, it is designed exclusively for Shimano Di2 electronic systems and does not support mechanical shifting.
2. What kind of handlebars are compatible with this model?
It fits aero bars with internal cable routing and standard clamp diameters used in triathlon and TT bikes.
3. Do I need to bleed the brakes during initial setup?
Yes, cutting the hydraulic hose requires a full brake bleed to ensure proper performance and safety.
4. Is wireless shifting possible with ST‑R8160 TT?
The model uses wired Di2 connections, but integrates with Shimano’s wireless unit (EW-WU111) for app configuration.
5. Can I upgrade from an older 11-speed Di2 setup to use this?
You must upgrade to a full 12-speed Di2 system including battery, derailleurs, and wiring to ensure compatibility.
6. How often should I inspect or service the system?
Check braking and shifting performance monthly. Full hydraulic service is recommended every 6–12 months depending on use.
Conclusion
The Shimano Ultegra ST‑R8160 TT brake set delivers race-ready performance for time trialists and triathletes seeking precision braking and effortless shifting. Its integration with the Di2 ecosystem ensures a cleaner, more aerodynamic cockpit, while customization via E-Tube Project offers tailored performance gains. With proper installation and maintenance, this system offers reliable, consistent operation that supports even the most aggressive race-day efforts.