Gravel riding demands a high level of control, especially in unpredictable terrain where traction can vary dramatically. The Clarks CMD‑22C Mechanical Brake Set is built to meet these challenges. With a design optimized for consistent stopping power, easy maintenance, and wide compatibility, this brake system stands out as a valuable upgrade for gravel enthusiasts.
Tools Required
- 5mm and 4mm Allen keys
- Torque wrench
- Mechanical cable cutters
- Rotor truing tool
- Isopropyl alcohol and clean cloth
- Flathead screwdriver
- Cable tensioner or inline adjuster
- Loctite (optional)
Installation Guide
Mounting the Caliper Units
Begin by attaching the calipers to the frame or fork using the supplied bolts. The CMD‑22C is compatible with standard post-mount and flat-mount adapters, making it suitable for most gravel framesets. Align the caliper over the rotor without tightening the bolts fully. Squeeze the brake lever while gradually tightening the bolts to ensure even pad clearance on either side of the rotor.
Cable Routing and Setup
Run the mechanical brake cable through the housing from the lever to the caliper. Trim the housing for the cleanest and most direct route possible, avoiding tight bends that could increase cable friction. Use a sharp cable cutter for a clean finish. Secure the cable in the anchor bolt of the caliper and ensure moderate tension. The CMD‑22C’s barrel adjuster offers fine-tuning once the system is clamped.
Rotor Installation
The CMD‑22C system is paired with 160mm rotors, which balance braking power and heat dissipation. Affix the rotors to the hubs using either center-lock or 6-bolt standards, depending on your wheel compatibility. Torque bolts to manufacturer specifications and inspect for any lateral movement or rubbing.
Adjustment and Pad Alignment
Centering the Caliper
Proper caliper alignment is essential to prevent rotor drag. Loosen the mounting bolts slightly, squeeze the brake lever to center the caliper, and then retighten the bolts while maintaining lever pressure. Spin the wheel and check for clearance. Adjust with a rotor truing tool if necessary.
Pad Clearance and Wear
The CMD‑22C features spring-return pistons that allow for manual pad adjustment. Use a flathead screwdriver to fine-tune each pad’s position in relation to the rotor. Check for equal gap on both sides and minimal rotor rub. Pads should be replaced when less than 1mm of compound remains.
Maintenance Best Practices
Regular Cable Tension Checks
Mechanical systems are more susceptible to cable stretch and housing contamination. Inspect cable tension monthly and replace frayed or corroded cables immediately. Light lubrication at housing exits can reduce friction and extend cable life.
Rotor Cleaning
Use isopropyl alcohol to clean rotors regularly, especially after wet or dusty rides. Dirty rotors reduce braking power and accelerate pad wear. Inspect for grooves or discoloration that may indicate overheating.
Pad Replacement Schedule
Depending on riding conditions, gravel use typically requires pad replacement every 1,500–2,000 kilometers. Use organic pads for less noise and better initial bite, or semi-metallic for durability on longer descents.
Troubleshooting Common Set-Up Issues
Brake Rub on Rotor
Rotor rubbing is often due to misalignment or warped rotors. Loosen caliper bolts, re-center using the lever method, and retighten. If rub persists, use a truing tool to gently adjust the rotor.
Spongy Lever Feel
A spongy feel in a mechanical setup usually results from cable stretch or housing compression. Inspect for proper cable tension, replace compromised housing, and verify that the outer casing is fully seated in all stops and adjusters.
Uneven Pad Wear
Uneven wear typically stems from caliper misalignment or contaminated pads. Ensure both pads make full and simultaneous contact with the rotor. Replace contaminated pads and clean rotors thoroughly.
Customization and Performance Optimization
Pad Compound Selection
Choosing the right pad compound can tailor braking behavior to specific terrain. Organic pads offer quieter operation and better modulation, while metallic pads provide better longevity under high-stress use.
Lever Compatibility
CMD‑22C calipers are compatible with standard short-pull road levers. For best modulation, match with levers offering high cable pull efficiency. Some levers also provide reach adjustment, ideal for riders with smaller hands.
Rotor Size Adjustments
While 160mm rotors are standard, moving to 180mm (if frame clearance allows) can increase braking power on heavier gravel builds or during long descents.
Comparison with Similar Models
CMD‑22C vs. Avid BB7 Road
Compared to the Avid BB7, the CMD‑22C provides a slightly more compact form factor, making it suitable for tighter gravel frame geometries. Though both offer tool-free pad adjustment, the CMD‑22C is easier to install and lighter in overall weight.
CMD‑22C vs. TRP Spyre
The TRP Spyre offers dual-sided pad actuation, improving pad wear uniformity. However, the CMD‑22C has a simpler setup and lower cost, making it more accessible for riders who prioritize ease of maintenance over marginal performance gains.
Compatibility with Drivetrain Components
Lever and Caliper Matching
The CMD‑22C is designed for use with short-pull road levers, including Shimano STI, SRAM DoubleTap, and equivalent drop-bar designs. It is not compatible with long-pull levers used in MTB applications.
Frame and Fork Standards
Compatible with frames featuring 74mm post-mount or flat-mount standards. Adapters may be necessary depending on your specific fork or frame design. Rotor clearance should also be verified, especially when upgrading from 140mm to 160mm.
Wheelset Compatibility
Use only wheelsets with ISO standard rotor mounts. Be sure that your hubs support the rotor mount type (center-lock or 6-bolt) compatible with the included rotors.
FAQs
Can the CMD‑22C be used with Shimano road shifters?
Yes, the CMD‑22C is fully compatible with Shimano STI short-pull levers.
How often should I replace the brake pads on gravel rides?
On average, every 1,500–2,000 km depending on terrain and weather conditions.
Are these brakes suitable for bikepacking?
Absolutely. Their mechanical simplicity and field-serviceability make them ideal for remote rides.
Do CMD‑22C brakes require bedding-in?
Yes. Perform several controlled stops from moderate speed to properly bed-in the pads and rotors.
Can I upgrade to larger rotors with this system?
Yes, provided your frame and fork can accommodate the size increase and you use the correct adapter.
Is dual-piston actuation necessary for gravel riding?
While dual-piston models like the TRP Spyre offer better pad wear symmetry, the CMD‑22C performs reliably with proper setup.
Conclusion
The Clarks CMD‑22C Mechanical Brake Set is an ideal companion for gravel riders who value reliability, ease of maintenance, and effective stopping power. Its compatibility with a wide range of road levers, simple installation, and customizable features make it a smart upgrade for those venturing off-pavement. Whether you’re tackling long-distance gravel routes or weekend trails, the CMD‑22C delivers dependable performance in all conditions.