Performance Adjustable Rear Upper Arms – Compatible with BMW F8X M2 / M3 / M4 2014–2021

BMW F8X Adjustable Rear Upper Arms (RUA) – Precision Camber Control for Street & Track

Achieving proper rear camber alignment is essential for maximizing tire life and cornering performance on the F8X chassis. Our adjustable Rear Upper Arms (RUA) provide the definitive solution, replacing the factory rear wishbone and guide links with a precision-engineered system designed to eliminate the aggressive camber curve inherent in the stock suspension.

The Factory Geometry Challenge

The stock BMW suspension exhibits an aggressive camber curve through bump travel—a characteristic that becomes significantly amplified on lowered vehicles. This results in either excessive negative camber that prematurely wears inner tire edges on the street, or insufficient camber that limits rear traction during high-performance cornering. Our Rear Upper Arms give you complete control to dial in the perfect alignment for any driving scenario.

Wide Adjustment Range, Absolute Precision

Engineered for versatility, these arms offer an extensive adjustment range for rear camber—easily optimized for daily commuting or track-day aggression. By replacing soft factory rubber bushings with smooth-articulating, Teflon-lined rod ends, bushing deflection is eliminated entirely, ensuring your alignment settings remain perfectly consistent under load.

Innovative Design for Effortless Adjustment

Lightweight & Durable Construction: Gun-drilled 2024 Aluminum links significantly reduce unsprung weight, finished with Black Anodizing for superior corrosion resistance and a durable, race-inspired appearance.

Exclusive Rotating Clamp Technology: Our patented 360-degree Rotating Clamps, precision-machined from 6061-T6 Aluminum, enable quick, precise adjustments without the frustration of traditional jam nuts or bearing misalignment.

Titanium Hardware: Blue Anodized Titanium Socket Head Cap Screws provide secure clamping while further reducing unsprung weight—strength is never compromised.

Precision Fit Components: Includes tapered stainless steel knuckle mount spacers for a factory-matched, wobble-free installation.

Advanced Bearing Technology

Featuring FK Spherical Bearings and Rod Ends, manufactured in Connecticut, with a chemically bonded PTFE (Teflon) liner:

Quiet Operation: Self-lubricating and self-cleaning design eliminates metal-to-metal noise.

Low Friction & Smooth Articulation: Ensures precise suspension movement under all conditions.

Elimination of Deflection: Maintains critical geometry during high-load maneuvers.

Exceptional Durability: High load capacity with enhanced dynamic wear characteristics. Operating temperature range: -65°F to 325°F for year-round reliability.

Kit Includes: Complete set of four (4) arms for one vehicle.