Raybestos 981990R Disc Brake Rotor - Rear

Reliable Disc Brake Rotor for Fiat 124 Spider and Mazda MX-5

The Raybestos R-Line 981990R disc brake rotor is engineered to provide consistent braking performance for your Fiat 124 Spider, Mazda MX-5, and MX-5 Miata. Designed with precise dimensions and a solid construction, this rotor meets the demands of daily driving and routine maintenance.

• Compatible with Fiat 124 Spider, Mazda MX-5, and MX-5 Miata models
• Part number 981990R for easy identification and replacement
• Solid disc brake rotor with smooth surface finish
• Overall height: 1.409 inches (35.800 mm)
• Outside diameter: 11.016 inches (279.800 mm)
• Nominal thickness: 0.374 inches (9.500 mm)
• Discard thickness: 0.295 inches (7.500 mm)
• Mounting bolt hole quantity: 4 with 0.520 inch (13.200 mm) diameter
• Center hole diameter: 2.165 inches (55.000 mm)
• Mounting bolt hole circle diameter: 3.937 inches (100.000 mm)

Raybestos R-Line Product Line Overview

The R-Line by Raybestos is a product line focused on delivering dependable brake components that meet or exceed OEM specifications. This line emphasizes durability and consistent performance, making it suitable for drivers who require reliable braking without unnecessary complexity. The 981990R rotor exemplifies these qualities with its solid design and precise fitment for select Fiat and Mazda vehicles.

Technical Details and Specifications

This disc brake rotor features a solid construction with a smooth surface type, ensuring even pad contact and effective braking response. The rotor's nominal thickness of 0.374 inches (9.500 mm) provides a substantial braking surface, while the discard thickness of 0.295 inches (7.500 mm) indicates the minimum safe thickness before replacement is necessary. The rotor measures 11.016 inches (279.800 mm) in outside diameter and 1.409 inches (35.800 mm) in overall height, designed to fit precisely on vehicles with a 4-bolt mounting pattern and a 3.937 inch (100.000 mm) bolt circle diameter.

Common Applications and Problem Solving

• Replacement for worn or warped rotors causing brake pulsation
• Addressing reduced braking efficiency due to rotor thickness below discard limits
• Eliminating noise and vibration from uneven rotor surfaces
• Restoring proper rotor dimensions for safe and effective braking
• Upgrading to a rotor that matches OEM specifications for Fiat 124 Spider and Mazda MX-5 models

Installation Notes and Tips

Ensure the rotor surface is clean and free of rust or debris before installation. Verify that the mounting bolt holes align correctly with the vehicle hub. It is recommended to replace brake pads simultaneously to maintain optimal braking performance. Check rotor thickness with a micrometer to confirm it meets nominal specifications and is above discard thickness. Proper torque specifications should be followed when securing the rotor to avoid warping.

Quality Assurance and Warranty

Raybestos R-Line rotors are manufactured to meet strict quality standards, ensuring reliable performance and durability. While specific warranty details for part number 981990R are not provided here, Raybestos products typically come with a limited warranty against defects in materials and workmanship. Consult the product packaging or manufacturer for exact warranty terms.