The Shimano SM-RT64 [paid link] disc brake rotor is a reliable, high-performance component designed for road and mountain bike applications. With its Center Lock mounting system and durable stainless steel construction, the SM-RT64 [paid link] delivers consistent braking power. However, improper installation or neglecting maintenance can lead to poor performance, noise, or premature wear.
This guide covers everything you need to know about installing, adjusting, and maintaining your Shimano SM-RT64 disc brakes to keep them running at peak efficiency.
Tools Required
To install and maintain your SM-RT64 disc brakes, you’ll need the following tools:
- Cassette lockring tool [paid link] (for Center Lock rotors)
- Torque wrench [paid link] (for precise tightening)
- Hex keys [paid link] (if using a 6-bolt adapter [paid link])
- Isopropyl alcohol (for rotor cleaning)
- Clean lint-free cloth
- Rubber gloves (to prevent contamination)
Installing the Shimano SM-RT64 Disc Brake Rotor
Step 1: Preparing the Wheel and Hub
Before installing the SM-RT64 rotor, ensure your wheel hub is clean and free from debris. Wipe the mounting surface with isopropyl alcohol to remove grease or dirt that could interfere with rotor alignment.
Step 2: Mounting the Rotor (Center Lock System)
The SM-RT64 features Shimano’s Center Lock system for quick and secure installation.
- Align the rotor’s splines with the corresponding splines on the hub.
- Slide the rotor into place, ensuring it sits flush against the hub.
- Thread the Center Lock lockring onto the hub by hand.
- Using a cassette lockring tool [paid link], tighten the lockring to 40 Nm using a torque wrench [paid link].
If your hub doesn’t support Center Lock, you’ll need a 6-bolt adapter [paid link] to mount the SM-RT64 rotor.
Step 3: Checking Alignment
Once installed, spin the wheel and check for any lateral movement in the rotor. If the rotor wobbles, it may not be seated properly. Loosen the lockring slightly, realign the rotor, and retighten it.
Adjusting the Shimano SM-RT64 for Optimal Performance
Step 1: Aligning the Caliper
If you notice rubbing or uneven braking after installation, caliper alignment is likely the issue.
- Loosen the brake caliper mounting bolts slightly so the caliper can move.
- Squeeze the brake lever firmly to center the caliper over the rotor.
- While holding the brake lever, tighten the mounting bolts evenly.
- Release the brake lever and spin the wheel to check for rubbing.
Step 2: Bed-In the Brake Pads
Properly bedding in your brake pads ensures maximum braking efficiency.
- Find a safe, open area where you can ride without interruption.
- Accelerate to around 15-20 mph (25-30 km/h) and apply the brakes firmly but smoothly.
- Repeat this process 15-20 times to transfer an even layer of pad material onto the rotor.
Maintaining the Shimano SM-RT64 Disc Brakes
Regular Cleaning and Inspection
To prevent brake noise and loss of stopping power, regularly clean your rotors and pads.
- Wipe the rotor with isopropyl alcohol and a lint-free cloth.
- Inspect for signs of wear, such as grooves or discoloration.
- Check the rotor thickness using a caliper—replace if thinner than 1.5mm.
- Avoid touching the braking surface with bare hands to prevent contamination.
Replacing Worn Brake Pads
If braking feels weak or noisy, your pads may be worn out.
- Remove the wheel for better access.
- Use a 3mm hex key to remove the pad retaining bolt.
- Slide the old pads out and insert new ones.
- Reinstall the retaining bolt and bed-in the new pads.
Checking for Warped Rotors
If you feel pulsating when braking, your rotor may be bent. Use a rotor truing tool to gently straighten any minor bends. For severe warping, replace the rotor.
Troubleshooting Common SM-RT64 Issues
1. Brake Noise or Squealing
- Ensure rotors and pads are clean and free of oil contamination.
- Sand the pads lightly with fine-grit sandpaper to remove glazing.
- Bed-in the pads properly after cleaning.
2. Poor Braking Power
- Check that the caliper is aligned correctly.
- Replace excessively worn brake pads.
- Bleed the hydraulic system if using hydraulic brakes.
3. Rotor Rubbing on the Pads
- Re-center the caliper using the method described earlier.
- Ensure the rotor is not bent.
- Check for proper wheel installation in the dropouts.
Comparison: SM-RT64 vs. Other Shimano Rotors
The Shimano SM-RT64 is a mid-range rotor that balances performance and affordability. Here’s how it compares to other Shimano rotors:
| Feature | Shimano SM-RT64 | Shimano SM-RT70 [paid link] | Shimano SM-RT86 (Ice-Tech) |
|---|---|---|---|
| Mounting System | Center Lock | Center Lock | Center Lock |
| Material | Stainless Steel | Ice-Tech (2-layer) | Ice-Tech (3-layer) |
| Weight | Moderate | Lighter | Lightest |
| Cooling Efficiency | Standard | Good | Excellent |
| Best For | General Use | High Performance | Extreme Conditions |
Conclusion
Installing, adjusting, and maintaining your Shimano SM-RT64 disc brake rotor correctly will ensure consistent braking performance and longevity. Regular cleaning, proper bedding-in, and timely pad replacement will help prevent common braking issues.