Verkline Adjustable Front Caster Control Arms / Tension Struts (Pair) – BMW Z4 G29 & Toyota GR Supra MK5 A90/A91 – Front Lower Control Arms, Radius/Thrust Arms, Rose-Jointed Wishbones, Caster Correction Kit

Transform steering feel and stability on BMW Z4 G29 and Toyota GR Supra A90 A91

Unlock precise front-end geometry control with this Verkline adjustable tension arm set. Engineered from a full 3D scan, developed in CAD, validated with FEA and proven on the road and track, these front wishbones deliver motorsport-grade accuracy in a direct-fit package. Supplied as a matched left and right pair for the front axle.

Why enthusiasts choose this upgrade

• On-car caster tuning via a turnbuckle style adjuster for quick, repeatable alignment changes.
• Stiffer construction for sharper turn-in, improved mid-corner stability and enhanced steering feedback.
• No compliant rubber bushes, so your alignment settings stay locked in under load and braking.
• Serviceable, easily sourced motorsport monoball bearings for long-term maintenance and performance.
• Near OE mass despite the added adjustability, keeping unsprung weight in check.

Built for performance and durability

• Direct-fit bolt-on kit with no cutting or permanent modifications to the chassis.
• Delivered pre-assembled to an initial baseline length to fast-track setup.
• Heavy-duty steel pins and threaded adjuster sleeves for strength under high loads.
• Precision CNC-machined 6082-T6 aluminium arms for high rigidity and low weight.
• High-articulation spherical joints provide a broad range of movement for lowered or track-focused setups.
• Lateral motion control prevents the arm from contacting the upright or steering linkage during extreme use.
• Complete kit supplied with the parts required to install on the car.
• Compatible with the factory knuckle and subframe.

Fitment

Front axle fitment for:

• BMW Z4 G29
• Toyota GR Supra A90
• Toyota GR Supra A91

Ideal for

Drivers seeking a front suspension upgrade for sharper handling and repeatable wheel alignment. Perfect for track days, drifting set-up changes, grip-focused builds and anyone wanting a caster correction kit that is easy to adjust on the car. Common search terms include adjustable tension struts, radius arms, front lower control arms, thrust arms, caster arms, rose-jointed wishbones and front suspension arms for BMW Z4 G29 and Toyota Supra A90 A91.

What we think

We run these on our own builds and customer cars. The on-car adjuster makes fine tuning caster quick and simple, and feedback has been consistently positive on steering precision and alignment stability.

Installation and support

Professional fitting available at MJ Modifications, Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and alignment setup advice.

Important notes

• Sold for off road, track and racing applications only.
• Solid bearings can increase noise, vibration and harshness compared to rubber bushed components.
• We strongly recommend installation by a qualified, experienced workshop.