The Shimano Ultegra ST‑R8160 TT brake set is a high-performance component designed specifically for time trial and triathlon bikes. Engineered to meet the aerodynamic needs of competitive racers, this dual-control lever integrates precise braking with seamless shifting. Its streamlined form reduces drag, while the advanced internals maintain the performance heritage of Shimano’s Ultegra series. In this guide, we’ll examine how this model improves stopping power, detail its installation and adjustment, explore optimization tips, and troubleshoot common issues.
Tools Required
- 5 mm and 4 mm hex wrenches
- Torque wrench with 4-6 Nm capacity
- Shimano hydraulic brake hose cutter
- Shimano mineral oil [paid link] and funnel bleeding kit
- Clean cloth and isopropyl alcohol
- Cable housing cutter (if using mechanical shift variant)
Installation Overview
The Ultegra ST‑R8160 TT is compatible with Shimano’s 12-speed Di2 platform and hydraulic disc brake systems. Installation should begin with careful routing of the brake hose or cable through the aerobar extensions or base bar. The levers are mounted at the end of the extensions, where they provide both ergonomic comfort and aerodynamic efficiency.
For Di2 setups, ensure that wiring for the electronic system is securely connected through the designated ports. When aligning the levers, position them symmetrically and check for lever reach using Shimano’s integrated reach adjust system. Once installed, torque all fasteners to the manufacturer’s specifications to prevent any risk of component failure.
Brake Lever Adjustment for Maximum Efficiency
Brake lever throw and modulation are critical to achieving optimal stopping power. The ST‑R8160 TT allows for fine-tuning the lever reach through an accessible adjustment screw. This is particularly beneficial for riders with smaller hands or those seeking a quicker engagement point.
Additionally, the hydraulic system provides excellent control over braking force. Adjustments to the brake calipers should focus on centering the rotor between pads and ensuring no pad rub occurs. Lever feel can be modified by changing the fluid volume within the reservoir or by trimming the hose to the appropriate length, reducing unnecessary slack and delay.
Maintenance for Consistent Performance
Maintaining the ST‑R8160 TT involves periodic bleeding of the hydraulic system and inspection of lever pivot mechanisms. Shimano recommends bleeding the brakes at least once per season or more frequently in high-use conditions. This ensures there are no air bubbles that can degrade performance.
Check the brake pads for wear and replace them when the thickness is below 1 mm. Clean the rotors using isopropyl alcohol to remove contaminants that can affect braking force. Also, inspect the lever body and return springs for any signs of fatigue or corrosion.
Troubleshooting Common Setup Issues
Improper hose routing or excessive slack often leads to sponge-like lever feel. In such cases, trimming the hose and performing a full system bleed usually resolves the issue. Another common problem is pad contamination, often mistaken for poor brake performance. Cleaning or replacing the pads, followed by a rotor wipe-down, typically restores full power.
If the lever doesn’t return smoothly after actuation, check for misalignment or debris within the pivot mechanism. Using a light silicone-based lubricant on moving parts can improve responsiveness without compromising braking integrity.
Customization and Optimization
The ST‑R8160 TT provides customization options tailored to rider preference. Lever reach can be adjusted, and the hydraulic feel can be personalized by using different hose lengths and internal fluid pressure.
Some riders prefer pairing the ST‑R8160 with a more aggressive rotor size—such as 160 mm instead of 140 mm—for improved heat dissipation and modulation on long descents. However, it’s essential to ensure that your frame and fork are compatible with the increased rotor diameter.
Additionally, pairing these levers with Shimano’s Ultegra BR-R8170 flat-mount calipers maximizes braking consistency and power. Matching the lever’s hydraulic characteristics with Shimano’s rotors and calipers ensures compatibility and avoids performance mismatches.
Comparison with Similar Models
Compared to the Dura-Ace ST-R9180 TT levers, the Ultegra ST‑R8160 TT offers similar hydraulic performance at a more accessible price point, albeit with slight differences in weight and finish. While the Dura-Ace model features more exotic materials for marginal gains, the Ultegra maintains nearly equivalent braking feel and reliability.
When compared to older 11-speed models like the ST-R8060, the ST‑R8160 offers improvements in ergonomics, better Di2 integration, and a more refined hydraulic circuit that enhances stopping predictability and modulation.
Compatibility with Drivetrain Components
The ST‑R8160 TT is fully compatible with Shimano’s 12-speed Di2 system, particularly when paired with the RD-R8150 rear derailleur and FD-R8150 front derailleur. It’s designed to integrate seamlessly into the latest generation of Shimano drivetrains, maintaining communication across junction boxes and battery systems.
For hydraulic braking, it works best with Shimano BR-R8170 flat-mount calipers and uses Shimano mineral oil as the fluid medium. Note that the ST‑R8160 is not backward compatible with mechanical shifting systems, and using it with non-Shimano calipers may void manufacturer warranties or degrade performance.
FAQs
1. Can the Ultegra ST‑R8160 TT levers be used with rim brakes?
No. These levers are designed exclusively for hydraulic disc brake systems and cannot be adapted for rim brake setups.
2. Are the ST‑R8160 TT levers compatible with 11-speed Di2 components?
No. They are only compatible with Shimano’s 12-speed Di2 components and require the latest electronic architecture for full functionality.
3. Do I need to bleed the brakes after cutting the hose?
Yes. Anytime the hydraulic hose is cut, the system must be bled to remove any air introduced during the trimming process.
4. How do I know if my rotors are contaminated?
If you hear squealing or notice a significant drop in braking power, your rotors may be contaminated. Clean them with isopropyl alcohol and inspect for oil residue or embedded debris.
5. What is the minimum rotor size compatible with these levers?
The recommended minimum rotor size is 140 mm. However, 160 mm rotors offer improved thermal management and may be preferred in hilly terrains.
6. How often should I replace brake pads when using the ST‑R8160 TT?
Brake pads should be replaced when the friction material is 1 mm or less in thickness. Check regularly, especially during the racing season.
Conclusion
The Shimano Ultegra ST‑R8160 TT brake sets offer precise control, excellent modulation, and aerodynamic efficiency, making them a top choice for time trial and triathlon riders. Their integration with Shimano’s 12-speed Di2 and hydraulic systems ensures high compatibility and performance across a wide range of conditions. With proper installation, regular maintenance, and thoughtful customization, riders can maximize both safety and speed on every course.