SPL Parts Adjustable Front Caster Rod Monoball Bushings - Toyota GR Supra (A90/A91) & BMW Z4 (G29)

OVERVIEW

SPL Parts FKS Series Adjustable Front Caster Rod Bushings (CRB) replace the stock flexible rubber bushings with low-friction, articulating spherical bearings, eliminating bushing deflection and reducing friction. This maintains optimum suspension geometry under load to improve braking and handling feedback.

Innovative CNC-machined offset bearing spacers provide ±4 degrees of caster adjustment — double the range of the G8X equivalent — letting you dial in turn-in response without replacing the factory arms. Also one of SPL's recommended solutions for creating sway bar clearance when running their front lower control arms.

SPECS

• FKS Series adjustable design
• Offset bearing spacers provide ±4 degrees of caster adjustment
• Massive 1"-sized FK Racing bearings with self-lubricating Teflon liners
• Eliminates bushing deflection and reduces friction under load
• Retains the factory caster rods — OEM arms not included
• Sold as a pair; made in the USA

PARTS INCLUDED

• 2x SPL FKS Series adjustable front caster rod bushings with FK 1" spherical bearings
• Offset bearing spacers for caster adjustment
• Mounting hardware (OEM arms not included)

TECH RESOURCES

• A professional wheel alignment is required after installation
• Sway bar clearance: SPL recommends this part as a solution for creating clearance between the sway bar and their Front Lower Control Arms (FLCA G29)
• Don't need caster adjustment? See our Non-Adjustable Caster Rod Bushings (CRBN G29) for the same deflection control at lower cost
• Pairs with our Tie Rod Ends (TRE G29) — correcting caster changes bumpsteer
• Spherical bearings transmit more noise and vibration than rubber bushings — expected on a performance component
• Professional installation recommended — bushing replacement requires a press
• Installation instructions (PDF): SPL CRB G29 Install Guide

PART NUMBER

• SPL CRB G29

VEHICLE APPLICATIONS