Shimano SM-RT66 Disc Brake Rotor - 6-Bolt - 180mm
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Product Information
Full details
The Shimano SM-RT66 180mm Disc Brake Rotor is designed for mountain bikers who prioritize consistent stopping power and mechanical reliability on the trail. It is an excellent upgrade or replacement for riders using 6-bolt hub interfaces who require a robust, easy-to-install braking solution. While it provides exceptional durability and compatibility with metal brake pads, it is specifically limited to 6-bolt mounting systems, meaning it is not compatible with Center Lock hubs without an adapter.
All features
| Series | SM-RT66 |
|---|---|
| Model Part Number | SMRT66M |
| Brand | Shimano |
Extended Product Information
FAQs
Can I use this rotor with resin pads?
Yes, while it is optimized for metal pads, it is compatible with resin brake pads as well.
Do the mounting bolts come with the rotor?
Yes, the SM-RT66 comes with the necessary mounting bolts and anti-loosen plates.
Is this compatible with Center Lock hubs?
No, this is a 6-bolt rotor. You would need a 6-bolt to Center Lock adapter to use it on Center Lock hubs.
What tool do I need to install the bolts?
You will need a T25 Torx wrench to properly tighten the rotor bolts.
Can I replace a 160mm rotor with this 180mm version?
You can, but you must install a 180mm brake caliper adapter on your fork or frame to account for the larger diameter.
Troubleshooting
Brakes are squealing or noisy
Clean the rotor surface with isopropyl alcohol and inspect the brake pads for contamination or glazing.
Rotor rubs against brake pads
Check the wheel seating in the dropouts and realign the brake caliper over the rotor.
Bolts keep loosening
Ensure the included anti-loosen plates are installed correctly and that bolts are torqued to the manufacturer's specification.
Pros and Cons
Pros
- Extremely reliable 6-bolt attachment method
- Enhanced safety with included anti-loosen plates
- Optimized for high-heat performance with metal pads
- Simple and straightforward installation process
- Durable design withstands intense trail use
Cons
- Not compatible with Center Lock hubs
- Requires specific T25 Torx tool for installation
- Heavier than high-end lightweight floating rotors
Setup, Compatibility & Care
Installation:
- Ensure your hub is configured for 6-bolt mounting.
- Place the rotor on the hub, ensuring the directional arrows point in the direction of wheel rotation.
- Position the anti-loosen plates over the bolt holes.
- Tighten the bolts in a star pattern to ensure even pressure.
Compatibility:
This rotor is compatible with standard 6-bolt disc hubs and is optimized for Shimano braking systems. Always verify your frame and fork clearance before upgrading to a 180mm rotor, as some older frames may require a post-mount adapter.
Care:
- Keep the rotor surface free of oils, grease, and chain lubricant.
- Clean with isopropyl alcohol periodically to maintain optimal friction.
- Inspect bolts regularly to ensure the anti-loosen plates are seated correctly.