Dynamite Friction 830-80072L Disc Brake Rotor - Rear Left

Rear Left Drilled and Slotted Rotor for MX-5 Miata

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted, part number 830-80072L, is a rear left disc brake rotor built for specific Mazda MX-5 Miata and Fiat 124 Spider applications. It combines a slotted X drilled surface with a rust resistant coating and Geospec Silver Grey hat finish for a clean, service-ready appearance.

Key Features

• Fits 2016-2025 Mazda MX-5 Miata, rear left.
• Fits 2017-2020 Fiat 124 Spider, rear left.
• Slotted X drilled brake surface for directional braking performance.
• Rust resistant coating helps protect exposed surfaces.
• Plain disc finish with Geospec Silver Grey hat finish.
• Solid rotor design with 280 mm outside diameter.
• 4-bolt, 4-lug pattern with 100 mm bolt circle diameter.
• Center hole diameter: 55 mm.

DFC Geoperformance Rotor Line

The DFC Geoperformance Rotor line focuses on application-specific brake rotors with drilled and slotted surfaces. For the Mazda MX-5 Miata and Fiat 124 Spider rear left position, part number 830-80072L uses a directional braking surface and corrosion-resistant coating to support consistent rotor appearance and service fitment.

Detailed Description

Part number 830-80072L is a Dynamite Friction disc brake rotor engineered for the rear left position on the Mazda MX-5 Miata and Fiat 124 Spider. The rotor measures 280 mm in outside diameter, 35.85 mm in overall height, and uses a solid construction with 9.5 mm nominal thickness and 7.5 mm discard thickness. Its slotted X drilled surface is paired with a directional brake face, while the Geospec Silver Grey hat finish and rust resistant coating help protect the rotor’s exposed areas.

This rotor is a direct-fit option for 2016-2025 Mazda MX-5 Miata rear left and 2017-2020 Fiat 124 Spider rear left applications. Part number 830-80072L is built around the specified bolt pattern, stud/lug hole diameter, and center bore dimensions for those vehicles.

Common Reasons to Replace

• Brake pulsation from rotor wear or uneven surface condition.
• Visible scoring, grooves, or heat checking on the braking surface.
• Corrosion on the rotor hat or exposed metal surfaces.
• Reduced braking consistency from a worn rear rotor.
• Service replacement for a rear left rotor on the listed Mazda MX-5 Miata or Fiat 124 Spider applications.

Installation Notes and Tips

Verify rear left fitment by matching the vehicle year, make, model, and rotor dimensions before installation. Confirm the 4-bolt, 100 mm bolt circle, 55 mm center hole, and 13.3 mm stud/lug hole diameter against the existing brake setup. Because this rotor uses a directional brake surface, install it in the correct orientation for the rear left position.

Quality Assurance

Dynamite Friction supplies this DFC Geoperformance Rotor with a rust resistant coating and application-specific dimensions for the listed vehicles. Part number 830-80072L is built to match the confirmed rear left fitment for the Mazda MX-5 Miata and Fiat 124 Spider applications.