Shimano’s Ultegra ST‑R8160 TT shifters are engineered primarily for time trial and triathlon settings, but their performance characteristics and integration options are increasingly drawing attention from gravel riders seeking streamlined aerodynamics and efficient braking systems. This article explores the installation, adjustment, maintenance, and customization of the Ultegra ST‑R8160 TT, while evaluating its suitability and performance for gravel biking adventures.
Tools Required:
- 4mm and 5mm hex wrenches
- Torque wrench with 4-6 Nm range
- Shimano hydraulic mineral oil
- Bleed kit compatible with Shimano brakes
- Clean rag and isopropyl alcohol
- Shimano SM-BH90 brake hoses (if replacing lines)
- Shimano TL-BH62 insertion tool (if cutting hoses)
- Digital caliper (for brake lever reach measurement)
Installation of the Ultegra ST‑R8160 TT Brake Set
Installing the Ultegra ST‑R8160 TT levers requires precision due to their aerodynamic profile and integration with hydraulic disc brake systems. The levers are designed for bar-end mounting on aero [paid link] extensions, which can also be adapted for specific gravel setups.
Begin by mounting the shifters into the ends of your aero extensions. Use a torque wrench to tighten the fixing bolts to the specified torque (5-6 Nm). Route the hydraulic hoses internally if your handlebar supports it, ensuring smooth curvature to avoid kinks.
Next, connect the hoses to the brake calipers. If shortening the hose, cut it cleanly and use the TL-BH62 tool to press in a new insert. Secure the olive and connector insert before tightening the connection nut to 5-6 Nm. Once the hose is secured, bleed the system to eliminate air and ensure optimal braking pressure.
Adjustment and Ergonomic Tuning
Despite being a TT component, the ST‑R8160 offers adjustable reach, a feature beneficial for gravel riders wearing gloves or dealing with unpredictable trail feedback. Use a 2mm hex key to adjust the lever reach screw located behind the pivot. Aim for a position that allows one-finger actuation with full braking power.
Brake pad clearance can be fine-tuned by aligning the calipers during installation. Loosen the caliper bolts, squeeze the brake lever to center the pads, and re-tighten. If rubbing persists, inspect rotor trueness or consider caliper alignment shims.
Routine Maintenance Best Practices
Hydraulic systems require regular upkeep to maintain performance. Check for contamination in the hydraulic fluid and bleed the system every 6-12 months depending on riding conditions. Inspect brake pads for wear; replace them when the pad material is under 1mm thick.
Ensure the brake rotor remains within the 1.8mm thickness minimum. A warped or worn rotor can degrade braking power and pad longevity. Clean the rotor surface with isopropyl alcohol after wet or dusty rides to prevent squealing and contamination.
Troubleshooting Common Set-Up Issues
Some riders report initial mushiness in brake feel after installation. This is usually due to residual air bubbles in the hydraulic lines. A second bleed or vacuum bleeding procedure often resolves this. Lever return lag may result from contaminated pistons or worn seals; clean the pistons with a lint-free rag and mineral oil.
Brake pad rubbing is often caused by improper caliper alignment or a bent rotor. Use a rotor truing tool to correct minor deviations, and re-align the caliper using the squeeze-and-tighten method.
Customization and Performance Optimization
Although the ST‑R8160 TT is inherently designed for aero disciplines, gravel cyclists can benefit from its lightweight design and ergonomic lever shape when paired with TT-style or short aero bars on gravel bikes. Combine with GRX or Ultegra flat-mount calipers for enhanced modulation.
For longer descents common in gravel routes, consider upgrading to Ice-Tech rotors and finned brake pads to improve heat dissipation. Using 160mm rotors front and rear provides a balance between control and heat management on steep trails.
Comparing Ultegra ST‑R8160 TT with Similar Models
When evaluating the Ultegra ST‑R8160 TT against Shimano GRX ST-RX810 or Dura-Ace ST-R9180, the trade-offs are clear. The GRX series offers a gravel-specific design with textured levers and integrated hoods, which are ideal for mixed-terrain control. However, the ST‑R8160 TT delivers superior aerodynamics and reduced cockpit clutter, which can appeal to gravel racers using aero extensions.
Compared to the Dura-Ace ST-R9180 TT, the Ultegra ST‑R8160 provides nearly identical performance at a lower price point, sacrificing only minor weight savings and finish refinement.
Compatibility with Other Drivetrain Components
The ST‑R8160 TT is compatible with Shimano’s Di2 12-speed electronic drivetrains and hydraulic brake calipers, allowing seamless integration into modern gravel and endurance bikes using the same generation groupset. It pairs optimally with Ultegra BR-R8170 or GRX BR-RX820 flat-mount calipers.
It does not support mechanical shifting or non-Shimano electronic drivetrains, limiting its cross-compatibility. Ensure firmware across all components is updated via Shimano’s E-Tube app to maintain synchronicity.
FAQs
Is the Ultegra ST‑R8160 TT suitable for gravel bikes without aero bars?
While it can be used, the shifters are optimized for bar-end installations on aero extensions, making them less ergonomic on standard drop bars.
Can I use Ultegra ST‑R8160 TT with GRX derailleurs?
Yes, as long as both are from the same 12-speed Di2 platform. Compatibility depends on E-Tube firmware consistency.
What rotor size is best for gravel with this brake set?
160mm rotors are ideal for gravel due to better heat management during long descents.
Do these shifters support mechanical drivetrains?
No, the ST‑R8160 TT is Di2-only and requires electronic derailleurs.
How often should I bleed the brakes on gravel rides?
At least once a year, or more frequently if riding in wet, muddy, or dusty environments.
Can the lever reach be adjusted for small hands?
Yes, reach adjustment is available via a screw behind the lever pivot, making it suitable for smaller hands or glove use.
Conclusion
The Shimano Ultegra ST‑R8160 TT brake set, while built for time trial and triathlon setups, holds surprising potential for gravel riders prioritizing lightweight design and cockpit simplicity. When combined with Di2 drivetrains and robust hydraulic calipers, it delivers reliable, modulated braking performance under demanding terrain. Though it requires thoughtful integration and ergonomic adjustments, its performance and customization capacity make it a viable choice for gravel enthusiasts seeking aerodynamic efficiency and modern brake performance.