Comparing Ultegra ST‑R8160 TT Brake Sets to Leading Competitors

The Shimano Ultegra ST‑R8160 TT brake set is purpose-built for time trial and triathlon setups, offering refined control, lightweight ergonomics, and compatibility with Shimano’s Di2 electronic shifting systems. In this guide, we examine its core features and installation process, provide practical maintenance insights, resolve common setup issues, explore performance optimization, and evaluate its position against leading competitor brake levers and shifters in the TT segment.

Tools Required

  • 5 mm hex wrench
  • 4 mm hex wrench
  • Torque wrench (4–6 Nm range)
  • Cable cutters (for Di2 wiring)
  • Shimano E-Tube Project app or compatible interface
  • Rubbing alcohol and clean rag for cleaning components
  • Disc brake spacer and bleed kit (for hydraulic systems)

Installation of the Shimano Ultegra ST‑R8160 TT

The ST‑R8160 TT levers feature Shimano’s latest Di2 dual-button shifting layout, specifically tuned for TT use. Installing the unit requires attention to both electronic and hydraulic system integration.

Begin by inserting the lever bodies into the bar ends, tightening the expansion bolts to the specified torque. Ensure the levers are aligned vertically to match rider ergonomics. Next, route the Di2 wiring from each shifter through the bar into a central junction box (either EW-RS910 or EW-JC130). The hydraulic hoses should be connected and trimmed to fit your frame size, ensuring slack for turning but avoiding sharp bends. Calipers must be pre-bled or bled post-installation, depending on the system.

Adjusting the ST‑R8160 TT System

The Ultegra ST‑R8160 TT offers adjustability through both mechanical and digital means. Lever reach can be modified using the internal reach adjustment screws to suit different hand sizes and bar profiles. The Di2 shifting can be customized using the Shimano E-Tube Project app to reassign button functionality or enable synchronized shifting modes.

Hydraulic brake feel can be modulated by adjusting pad contact points and ensuring lever bite point is consistent. For optimal braking, caliper alignment and rotor clearance must be fine-tuned during setup.

Routine Maintenance and Care

Maintenance of the ST‑R8160 TT system involves periodic inspection of electronic connections and hydraulic performance. Di2 wires should be checked for secure connections and potential wear from internal routing. Firmware should be kept updated via the E-Tube app to maintain optimal performance.

Hydraulic systems require regular bleed cycles, typically every 6–12 months depending on use. Clean the levers and bar area with isopropyl alcohol to avoid contamination of braking surfaces. Ensure the levers return smoothly to position and monitor for any spongy brake feel, which may indicate air in the lines or fluid degradation.

Troubleshooting Common Setup Issues

Several recurring setup issues affect the ST‑R8160 TT, particularly during initial installation:

  • Inconsistent Shifting: Often due to incomplete Di2 wire insertion. Re-seat connectors firmly until a click is heard.
  • Soft Brake Feel: Typically air in the hydraulic line or improper pad spacing. Bleed the system and inspect caliper alignment.
  • Unresponsive Buttons: Caused by outdated firmware or improper port assignment in the junction box. Update firmware and verify connections in the app.
  • Lever Rubbing on Bar End: Indicates over-tightened or misaligned mounting. Loosen and reposition the levers to correct alignment.

Optimizing Performance of ST‑R8160 TT

To extract full performance from the Ultegra ST‑R8160 TT, users should tailor the lever placement for a natural wrist angle when in aero [paid link] position. Combining with Shimano’s disc brake calipers (BR-R8170) enhances braking consistency under load.

Use Shimano’s synchronized shift feature for automatic front derailleur adjustment based on rear gear selection, minimizing cognitive load during high-effort efforts. Lever button assignment can be remapped to match rider preference, improving ergonomics and efficiency in competition settings.

Compatibility Considerations

The ST‑R8160 TT is fully compatible with Shimano’s 12-speed Di2 groupsets, including Ultegra R8100 and Dura-Ace R9200 series. It is not backward-compatible with mechanical drivetrains or 11-speed Di2 platforms. For braking, it pairs with Shimano’s flat-mount hydraulic disc systems and is optimized for use with RT-MT800 or RT-CL800 rotors.

Handlebar compatibility is limited to internal bar-end routing setups, common on most TT and triathlon bars. Ensure adequate space for hydraulic hose and Di2 wire passage.

Comparison With SRAM and Campagnolo TT Brake Levers

When assessing the ST‑R8160 TT against its main competitors—namely SRAM’s eTap AXS Aero HRD levers and Campagnolo’s Super Record EPS TT levers—several distinctions emerge:

1. Shifting Integration
The Shimano ST‑R8160 TT supports dual-button functionality per lever, allowing intuitive gear control. SRAM’s AXS Aero levers have single-button shifting, requiring a different logic for gear changes, while Campagnolo offers traditional multi-button mapping with limited customization.

2. Braking Performance
Shimano’s hydraulic disc braking remains a benchmark for modulation and fade resistance. SRAM’s HRD system performs closely, though some users report longer lever throw. Campagnolo’s system, while precise, lacks the wide user base and familiarity found in Shimano’s offerings.

3. Ergonomics and Fit
Shimano levers offer fine-tuned reach and narrow profiles, aiding aerodynamic integration. SRAM AXS levers have a slightly bulkier form, while Campagnolo’s levers are optimized more for traditional bar setups than aggressive TT cockpits.

4. Customization and Software
Shimano’s E-Tube software is robust, offering deep configurability and diagnostics. SRAM AXS provides wireless updates and customization via its AXS app, offering cleaner setups. Campagnolo’s interface is more limited in configuration scope.

5. Compatibility and Ecosystem
Shimano’s ecosystem provides seamless integration within their Di2 system but requires all components to be from the 12-speed platform. SRAM’s wireless platform offers cross-compatibility across its eTap AXS ecosystem. Campagnolo EPS remains the most proprietary, with strict component matching requirements.

Final Verdict

The Shimano Ultegra ST‑R8160 TT brake set is a refined, race-ready system for TT and triathlon athletes who prioritize integration, customization, and braking consistency. Compared to SRAM and Campagnolo offerings, it delivers superior modularity and ergonomics within the Shimano 12-speed Di2 ecosystem. While wireless alternatives offer cleaner setups, the precision and feel of the ST‑R8160 TT make it a compelling option for riders focused on performance and control.