Hardrace Rear Knuckle Pillow Ball Bushing – Honda Civic/Integra (6593F)

Product Overview

While hardened rubber upgrades significantly reduce suspension play, high-level motorsport, competitive time attack, and aggressive track day builds require absolute structural rigidity. The Hardrace Rear Knuckle Pillow Ball Bushing – Honda Civic/Integra (6593F) kit is a true race-grade overhaul designed to replace flexible factory knuckle links with completely solid-state spherical joints.

This comprehensive 6-piece full axle kit completely replaces all three factory bushing points inside your rear wheel hubs. By utilizing Hardrace’s advanced spherical pillow ball (uniball) architecture, this kit permanently locks your rear wheel knuckles into their intended geometric paths—ensuring your alignment parameters stay mathematically static under extreme lateral G-forces.

Key Features & Benefits

• Comprehensive 6-Piece Motorsport Set: Replaces all three critical control-arm-to-knuckle connections per side across both rear hubs for a unified, flex-free assembly.

• Zero Alignment Geometry Deflection: Completely eradicates dynamic rear camber, toe, and caster drift, keeping your tire contact patch absolutely stable at the limit.

• Motorsport-Grade Spherical Bearings: Provides fluid, binding-free pivot movement, letting your coilovers react instantly to road imperfections without binding.

• Fully Booted TPV Dust Seals: Every spherical joint is enclosed inside heavy-duty Thermoplastic Vulcanizate (TPV) rubber boots to keep out track grime, moisture, and road salt for extended reliability.

• Pure Mechanical Feedback: Removes the isolating, vague cushion of factory rubber, communicating rear slip angles directly to the driver’s seat.

• Advanced Self-Lubricating Liners: Utilizes precise high-molecule polymer inner tubes paired with high-tensile steel alloy jackets to minimize mechanical wear and friction.

• OEM Direct Press-Fit Execution: Precision CNC-machined to exact factory tolerances for a secure press-fit inside original rear wheel knuckles.

Technical Specifications

Applications

This specific Part Number 6593F race-series spherical bushing array is engineered to press flawlessly into the rear wheel knuckles of the following 2001–2006 Honda and Acura platforms:

• Honda Civic 7th Gen (2001–2005 EP1 / EP2 / EP3 / EP4 / EM2 / ES1 / EU Chassis – Including Type R and USDM Si models)

• Honda Integra 4th Gen (2001–2006 DC5 Chassis – Including Base, Type S, and Type R)

• Acura RSX (2002–2006 DC5 All Models – Including Base and Type-S)

• Honda Stream 1st Gen (2000–2006 RN1 / RN2 / RN3 / RN4 / RN5 Chassis)

The Mechanical Advantage: True Spherical Rigidity at the Wheel Hub

On the EP3 Civic and DC5 Integra multi-link rear suspension layout, the rear upper arm, lower arm, and toe arm all converge onto three tightly spaced bushing points inside the rear knuckle. When you throw your car into a high-speed apex or slam on the brakes, the entire leverage of the rear tire acts directly against these three hub bushings. If there is even a millimeter of play in those factory rubber or aftermarket polyurethane bushings, the entire rear knuckle twists horizontally. This sudden deflection triggers a dynamic rear toe-out shift—the primary culprit behind sudden snap oversteer, unstable braking wander, and sudden traction loss.

The Hardrace 6593F Pillow Ball bushings provide an unyielding, zero-flex engineering solution. Because the arms pivot cleanly on solid steel bearings rather than trying to twist and compress through flexible material, they allow your rear suspension to compress and rebound freely without altering your pre-set alignment specs. Unlike raw, unbooted open race bearings that rattle loose within months on the road, Hardrace fully seals their uniballs in weather-proof TPV dust covers. This ensures you enjoy uncompromised, motorsport-level handling and consistent lap times season after season.

Professional Multi-Bushing Pressing & Alignment at JDMaster

Get it Fitted by the Experts: We offer full professional installation and heavy-duty hub bushing press services right inside our workshop.

Because installing zero-deflection pillow ball components increases your vehicle’s sensitivity to tracking parameters, our master technicians can run your Honda through our alignment rack to dial in your custom track specs. Contact us today to secure your workshop appointment!

Warranty

The warranty on Hardrace products depends on the type of product, with a minimum warranty period of 2 years. This warranty does not cover damage caused by a car crash, improper use, negligence or normal wear and tear.