The Yokozuna Ultimo Hy/Mech [paid link] brake sets represent a unique hybrid solution for cyclists who demand superior stopping power without committing to full hydraulic systems. Designed as a cable-actuated hydraulic caliper system, the Ultimo Hy/Mech offers the modulation benefits of hydraulics while maintaining compatibility with mechanical brake levers. This review examines its performance specifically on gravel terrain—where control, responsiveness, and durability are paramount.
Tools Required
- 5mm Allen key
- Torque wrench
- Cable cutters
- Compression ferrules and cable housing
- DOT-compatible hydraulic fluid (for maintenance)
- Bleed kit (Yokozuna-compatible)
- Clean rag and isopropyl alcohol
Installation Process of the Ultimo Hy/Mech
Installing the Ultimo Hy/Mech is relatively straightforward but requires attention to detail for optimal performance. Begin by mounting the calipers using a 5mm Allen key. The post-mount design simplifies installation, but alignment is critical. The caliper pistons should center over the rotor to avoid uneven pad wear.
Next, route standard compressionless cable housing from the brake lever to the caliper, making sure there are no sharp bends that could reduce braking efficiency. The Ultimo Hy/Mech uses standard mechanical cable pull, so no hydraulic hose routing is needed.
Insert and secure the inner cable into the actuating arm of the caliper. Torque the pinch bolt to the manufacturer’s specifications. After initial installation, check that the rotor spins freely and the brake lever activates with minimal slack.
Adjustment Guidelines for Peak Performance
Adjusting the Ultimo Hy/Mech requires fine-tuning both pad clearance and cable tension. Begin by aligning the caliper to the rotor. Loosen the mounting bolts slightly and squeeze the brake lever to center the caliper. Tighten the bolts while holding the lever to maintain alignment.
Use the barrel adjuster at the caliper or brake lever to set ideal cable tension. This ensures that the pads contact the rotor without excessive lever travel. For micro-adjustments, access the pad adjusters located on the caliper body. Turn clockwise to reduce pad clearance or counterclockwise to increase it.
On gravel terrain, tighter tolerances improve responsiveness but must not result in rotor rub. Always double-check for free rotor spin after adjustments.
Maintenance Requirements and Recommendations
The hybrid design of the Ultimo Hy/Mech necessitates occasional hydraulic maintenance despite its mechanical actuation. Over time, the calipers may develop air bubbles or contaminated fluid, especially in dirty gravel conditions.
Periodic bleeding is recommended to maintain braking power. Use DOT-compatible hydraulic fluid as specified by Yokozuna. Bleed intervals depend on ride frequency and terrain exposure but are generally advisable every 6–12 months for gravel riders.
Keep rotors and calipers clean by wiping them down with isopropyl alcohol after muddy or dusty rides. Also inspect brake pads for glazing or embedded grit [paid link], which can degrade performance and damage rotors.
Troubleshooting Common Set-Up Issues
Some users report spongy lever feel, often caused by cable stretch or trapped air in the caliper. If cable tension is inadequate, readjust via the barrel adjuster or re-clamp the cable at the pinch bolt.
Persistent rotor rub can stem from misaligned calipers or contaminated pistons. Re-center the caliper and clean pistons thoroughly during maintenance.
Another common issue is insufficient power, typically due to excessive pad clearance or degraded hydraulic fluid. Re-bleeding and pad adjustment usually resolve the problem.
Customization and Optimization for Gravel Performance
For riders seeking enhanced gravel-specific performance, upgrading to compressionless cable housing significantly improves braking feel and modulation. Pairing the Ultimo Hy/Mech with high-friction brake pads can also offer better bite in wet or loose conditions.
Rotors should be 160mm or larger for gravel use to maximize stopping power on descents. Using a power-modulated mechanical lever, such as those from TRP or Cane Creek, can further refine braking feel.
Attention to small adjustments—like equal cable tension and precise pad placement—allows gravel cyclists to fine-tune braking response based on terrain and rider weight.
Comparative Evaluation: Ultimo Hy/Mech vs. Other Hybrid Calipers
Compared to other hybrid calipers like the TRP HY/RD [paid link] and Juin Tech GT-F, the Yokozuna Ultimo Hy/Mech stands out in two areas: consistent modulation and lightweight construction.
While the HY/RD offers similar stopping power, it often feels more abrupt in modulation. The Juin Tech system is lighter but lacks the same robust build for long gravel rides. The Ultimo’s forged aluminum calipers strike a balance between performance and durability, making them ideal for rough, unpredictable terrain.
In terms of lever compatibility, all three systems accommodate standard mechanical levers, but the Ultimo’s actuation mechanism offers a smoother ramp-up of power, especially beneficial on loose gravel descents.
Compatibility With Drivetrain and Brake Levers
The Ultimo Hy/Mech is compatible with most mechanical and mechanical-hydraulic drop-bar brake levers from Shimano, SRAM, and Campagnolo. It does not require high cable pull levers, making it versatile across various drivetrain setups.
It also works seamlessly with standard 140mm and 160mm rotors, though 160mm is preferable for gravel applications. As it uses conventional brake cables and housing, it integrates well into both modern and legacy frames without internal routing.
Riders should ensure that the caliper mounting standards (post mount or flat mount) on their frames and forks match the Ultimo variant they purchase.
Conclusion
The Yokozuna Ultimo Hy/Mech brake set offers a compelling mix of hydraulic braking performance and mechanical simplicity. On gravel terrain, where responsiveness and reliability matter most, it provides strong, consistent stopping power with excellent modulation. While minor adjustments and occasional bleeding are required, its overall ease of use and wide compatibility make it a worthy upgrade for riders looking to bridge the gap between mechanical convenience and hydraulic performance.