The Shimano Ultegra ST‑R8160 TT brake levers, designed specifically for time trial and triathlon use, have found a surprising niche in gravel riding setups. With their streamlined shape, integrated hydraulic braking system, and compatibility with modern drivetrains, they offer performance benefits that make them increasingly popular among gravel enthusiasts looking for reliability, aerodynamics, and braking precision in challenging conditions.
Tools Required
- 4mm and 5mm Allen wrenches [paid link]
- Torque wrench
- Shimano mineral oil [paid link]
- Bleed funnel kit
- Clean rag and isopropyl alcohol
- Shimano disc brake caliper tool
- Cable housing cutter
Installation of the Ultegra ST‑R8160 TT on Gravel Bikes
Installing the ST‑R8160 TT brake levers on a gravel setup requires a deliberate approach, given their design for time trial bikes. However, their functionality translates well to custom drop-bar or aero [paid link]-bar gravel builds.
Begin by securing the levers to aero extensions or drop bars designed to accommodate internal cable routing. Tighten the clamp bolts to Shimano’s recommended torque specification (6-8 Nm). Ensure housing routes cleanly into the frame and fork, minimizing tight bends that could impede fluid flow or cause kinks in the hydraulic line.
Connect the hydraulic hose to the lever using the Shimano BH90 hose and ensure proper cutting and insertion of the olive and barb. Secure the connection firmly with a 5mm Allen key, then proceed to the caliper installation. Bleed the system according to Shimano’s protocols using a bleed funnel and mineral oil. Finish by aligning the brake calipers and bedding in the pads.
Adjusting the Braking System for Off-Road Conditions
The ST‑R8160 TT levers offer minimal external adjustment options, but the hydraulic system provides consistent power with proper setup. Gravel riding demands strong modulation, so lever feel and pad contact must be finely tuned.
After bleeding, fine-tune caliper alignment by loosening the mounting bolts, squeezing the brake lever, and tightening the bolts while maintaining pressure. This centers the caliper and reduces rotor rub. To adjust pad wear compensation, periodically inspect for piston retraction issues and reset pistons if necessary using a plastic lever or Shimano caliper tool.
Ensure that lever reach suits your hand size and bar configuration. While the ST‑R8160 does not offer tool-free reach adjustment, modifying lever clamp positioning along the bar extension can help dial in ergonomics.
Routine Maintenance to Extend Component Life
Hydraulic systems demand regular upkeep, especially in dusty or wet gravel environments. Begin with monthly visual inspections for hose damage, fluid leaks, or degraded bar tape that could affect routing.
Replace brake pads when the compound reaches the wear indicator. Resin pads wear faster in gritty terrain, so frequent inspection is necessary. Clean rotors with isopropyl alcohol and check for warping or contamination. Contaminated rotors should be sanded or replaced to restore braking consistency.
Annual brake bleeds are advisable even without noticeable fade. Gravel conditions introduce micro air bubbles that can reduce performance subtly over time. Always use Shimano mineral oil to preserve seal integrity.
Troubleshooting Common Setup Issues
Improper installation can lead to performance issues that manifest quickly under gravel riding conditions. A common issue is rotor rub, often caused by misaligned calipers or warped rotors. This can be resolved by recalibrating caliper position and checking rotor trueness.
If the lever feel becomes spongy, air may be trapped in the system. Re-bleeding is necessary. Soft bite points usually indicate pad contamination or excessive pad wear—replace pads accordingly.
Riders experiencing inconsistent brake engagement in wet conditions may have contaminated rotors or improper pad compound. For gravel riding, consider using sintered pads for improved wet weather performance.
Customization and Optimization for Gravel Performance
Though built for TT bikes, the Ultegra ST‑R8160 TT levers can be creatively adapted to suit gravel bike cockpits. Many gravel riders using aero bars opt for these levers due to their compact size and powerful hydraulic feel.
Optimizing performance includes selecting the right pad compound for terrain—resin for quieter operation or metallic for durability. Pairing the levers with Shimano RT-CL800 rotors ensures heat management on long descents.
Internally routing hydraulic lines through handlebars and frames can improve aerodynamics and reduce exposure to elements, though it requires advanced mechanical skill. Additionally, choosing flared aero bars improves control and stability when using ST‑R8160 levers on gravel setups.
Model Comparison: Ultegra ST‑R8160 TT vs. Dura-Ace ST‑R9180 TT
While the Dura-Ace ST‑R9180 TT is Shimano’s top-tier option, the Ultegra ST‑R8160 TT delivers nearly identical braking performance at a more accessible price. Weight differences are negligible in most gravel applications, and both models use the same hydraulic system and ergonomic design.
The Ultegra model slightly lacks in finish quality and weight savings but remains a preferred choice for riders balancing cost and performance. For gravel riders not seeking ultra-lightweight components, the ST‑R8160 TT provides outstanding value.
Compatibility with Gravel Drivetrain Components
The ST‑R8160 TT levers are fully compatible with Shimano 12-speed Di2 drivetrains, making them ideal for gravel builds using GRX Di2 derailleurs or Ultegra Di2 road setups. Their Di2 satellite port allows for integration with satellite shifters or bar-end switches, enhancing shifting flexibility during technical terrain.
Hydraulic hose and rotor compatibility remain consistent across Shimano’s road and gravel lineup, allowing seamless integration with GRX or Ultegra calipers. This flexibility is crucial when customizing mixed-component setups common in gravel builds.
FAQs
Q1: Can I use the Ultegra ST‑R8160 TT brake levers with mechanical drivetrains?
No. These levers are specifically designed for Shimano’s 12-speed Di2 electronic shifting systems and are not compatible with mechanical derailleurs.
Q2: Are the ST‑R8160 TT levers suitable for full drop bar setups?
They can be used with drop bars if mounted on clip-on aero extensions or other custom solutions, but they are not a direct replacement for standard drop bar levers.
Q3: How often should I bleed the brakes in gravel riding conditions?
At least once a year, or sooner if you notice spongy lever feel or reduced braking power.
Q4: Do I need Shimano-specific rotors to use with the ST‑R8160 TT?
Using Shimano Ice-Tech rotors like the RT-CL800 ensures optimal heat dissipation, but other center-lock rotors can be used if they match the caliper spacing and specifications.
Q5: Can these levers be used for bikepacking as well as racing?
Yes. Their compact size and strong braking make them excellent for technical descents and loaded riding in bikepacking setups.
Q6: What’s the main advantage of using TT levers for gravel?
They offer excellent hydraulic braking in a small form factor, perfect for custom cockpits or aero-oriented gravel race builds.
Conclusion
The Shimano Ultegra ST‑R8160 TT brake levers offer a powerful, compact, and adaptable braking solution for gravel riders seeking superior modulation and minimalist ergonomics. While originally designed for time trial bikes, their performance benefits are uniquely suited to gravel conditions where control, reliability, and flexibility matter most. With proper installation, tuning, and maintenance, these brake sets can become a critical component in any high-performance gravel setup.