Shimano SM-RT66 – 180 mm 6-Bolt Disc Brake Rotor
The Shimano SM-RT66 180 mm disc brake rotor is designed to deliver consistent braking performance across a variety of riding conditions. Featuring a standard 6-bolt mounting interface, it is suitable for compatible mountain, gravel and road bicycles.
Its stainless steel construction provides a durable braking surface, while Shimano's anti-loosening plates help keep the rotor mounting bolts secure.
Compatible with both metal and resin brake pads in supported braking systems, the SM-RT66 offers a versatile replacement option for cyclists seeking dependable disc brake performance.
Key Features
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180 mm diameter: Provides a braking surface for compatible disc brake systems.
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6-bolt mounting: Fits standard ISO 6-bolt disc brake hubs.
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Stainless steel construction: Durable braking surface designed for consistent performance.
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Anti-loosening plates: Help secure the rotor mounting bolts.
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Metal and resin pad compatibility: Supports both compounds when used with compatible brake calipers.
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Versatile applications: Suitable for compatible mountain, gravel and road bicycles.
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Genuine Shimano replacement part: Designed for reliable braking performance.
Technical Specifications
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Brand: Shimano
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Model: SM-RT66
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Product type: Disc brake rotor
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Diameter: 180 mm
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Mounting system: ISO 6-bolt
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Bolt circle diameter: 44 mm
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Material: Stainless steel
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Nominal thickness: 1.75 mm
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Compatible pad compounds: Metal and resin
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Compatible pad shape: Narrow type
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Anti-loosening plates: Yes
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Manufacturer reference: ESMRT66M
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Application: Compatible mountain, gravel and road bicycles
Reliable Braking Performance
The SM-RT66 uses a durable stainless steel braking surface designed to provide predictable stopping performance.
Its 180 mm diameter can provide additional braking leverage compared with a smaller rotor when the braking system is designed to accommodate it.
Secure 6-Bolt Installation
The standard ISO 6-bolt mounting interface is compatible with hubs featuring six rotor mounting holes.
Shimano's anti-loosening plate design helps secure the mounting bolts and supports dependable installation.
Compatibility
The SM-RT66 requires a 6-bolt-compatible hub and a brake system approved for a 180 mm rotor.
It is compatible with metal and resin brake pads of the appropriate narrow type, provided the brake caliper also supports the selected pad compound.
It does not mount directly to Center Lock hubs.
Before installation, verify the frame or fork's permitted rotor diameter, brake caliper compatibility and any required mounting adapter.
Maintenance
Inspect the rotor regularly for wear, deformation and contamination. Replace it when the braking surface reaches Shimano's specified minimum thickness.
Follow Shimano's installation instructions and prescribed tightening torques.
Note: This product is one 180 mm disc brake rotor. Verify the included mounting hardware against the specific retail package.
