StopTech 121.66013 SportStop Plain Replacement Disc Brake Rotor

The StopTech 121.66013 is a SportStop plain disc brake rotor designed as a premium direct-replacement upgrade over worn or standard OEM rotors. Built to meet or exceed original equipment specifications, this rotor delivers confident, consistent stopping performance for everyday street driving without requiring any modifications to the existing factory brake system.

Manufactured from StopTech's advanced high-carbon iron alloy, the 121-series SportStop rotor offers superior resistance to noise, vibration, and harshness (NVH) compared to standard replacement rotors. The non-friction surfaces are finished with a black electrostatic E-coating that provides robust corrosion protection on the hat and cooling vanes, tested to withstand extended salt exposure without rusting.

Key Features:

• Plain (non-drilled, non-slotted) friction surface for maximum pad contact area and optimal heat sink performance
• High-carbon metallurgy for quieter operation, improved crack resistance, and longer service life
• Black E-coat finish on non-swept areas for long-lasting corrosion protection
• Double disc ground friction surface ensures a consistent, flat braking surface and proper pad bed-in
• 100% mill-balanced to minimize vibration and pedal pulsation
• Lateral runout held to 0.002" or less for smooth, judder-free braking
• Direct OEM replacement — fits stock calipers with no modifications required
• Meets or exceeds OEM quality specifications including cooling vane design and extractor hole details

The StopTech 121.66013 is an excellent choice for drivers seeking a reliable, high-quality rotor replacement that improves on OEM durability and finish quality while maintaining a factory-correct braking feel.