KYB 551115 Suspension Strut - Front

KYB Gas-a-Just Front Strut for RX-8

The KYB Gas-a-Just 551115 is a monotube suspension strut built as an OE-style replacement for the front of select Mazda RX-8 models. It is engineered to restore original handling response while maintaining a controlled ride in everyday driving.

For 2004-2008 Mazda RX-8 front suspension service, this KYB Gas-a-Just strut uses a high-pressure monotube design with separate gas and oil chambers for quick response and consistent damping. Part number 551115 is also a direct search match for shoppers comparing OE replacement front struts for the RX-8.

Key Features

• Monotube OE replacement design for front suspension service
• Restores designed control and handling on the Mazda RX-8
• High-pressure nitrogen gas chamber supports fade-resistant operation
• Separate gas and oil areas provide responsive damping
• Triple chrome plated piston rod helps reduce seal wear
• Built for vehicles with added load, towing demands, or larger wheels and tires
• Supports proper operation of electronic safety systems when suspension performance is maintained

Product Details

KYB Gas-a-Just 551115 is part of the Gas-a-just line, KYB’s monotube strut family focused on OE replacement performance. The design uses an air-free hydraulic piston area for control and a separate high-pressure gas chamber with a floating piston to deliver a firm, immediate response when the suspension is working harder. This front strut is a strong match for drivers searching for a 2004-2008 Mazda RX-8 front strut replacement, especially when restoring factory-like steering feel and suspension control matters.

This part cross-references Monroe Shocks & Struts (e.g., 71122) for the same application.

Common Issues This Strut Can Address

• Excessive front-end bounce or poor damping control
• Loose or delayed steering response
• Reduced handling stability over bumps and uneven pavement
• Suspension performance loss from worn internal valving or fluid leakage
• Front ride quality changes after wear from age, mileage, or heavier wheel and tire setups

Installation Notes and Fitment

Fits 2004-2008 Mazda RX-8, front, recommended OEM replacement; excludes SHINKA and Performance Packages. Confirm upper and lower mount types before installation, and compare compressed length, extended length, and stroke to the removed strut for proper fitment. Professional installation and a wheel alignment are recommended after suspension replacement.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to help restore original suspension capability. The triple chrome plated piston rod is used to reduce seal wear and support long-term sealing performance under normal suspension movement.