Front Steering Knuckle Kit to Suit Isuzu D-Max & MU-X & Mazda BT-50

KCA514 Steering Knuckle Kit - Bump Steer Correction
Optimizing Steering Geometry for Better Handling and Safety

The KCA514 Steering Knuckle Kit is designed to improve steering geometry and reduce bump steer. It is completely legal and doesn’t require engineering certification or modification plates. This product is VSB 14 approved and ADR compliant. It functions similarly to installing an upper control arm in your vehicle.

Our engineering team has rigorously tested the aftermarket front knuckle (KCA514) to VSB 14 load standards using FEA analysis, assessing it for a front axle rating of 1650kg. The tests confirm that the product exceeds strength requirements. It is compatible with any GVM upgrade.

VSB 14 Compliance & Legality

VSB 14 outlines legal requirements for aftermarket modifications. The KCA514 knuckle is classified as owner-certified, meaning no engineer or certification is needed once installed. This is similar to installing legal modifications such as upper control arms, shocks, or lift kits.

ADR Compliance & Legal Status

The Australian Design Rules (ADRs) set national safety, anti-theft, and emissions standards for vehicles. While there are no specific ADRs for steering knuckles (similar to control arms or shocks), the KCA514 steering knuckle meets OE (Original Equipment) design standards. As there are no ADRs governing the "robustness of a vehicle," VSB 14 is the primary standard for in-service modifications.

Comparison to Other In-Service Modifications

Other similar in-service bolt-on modifications that don’t require engineering or mod plates include:

1. Leaf Spring Replacement – Parabolic vs. original leaf springs.
2. Front Strut Swap – OE strut to Formula 4x4 or equivalent.
3. Bull Bar Installation – No issues with fitting a bull bar.
4. Control Arm Upgrade – Replacing a steel control arm with an alloy one.

Whiteline products undergo extensive testing to ensure compliance with relevant engineering standards, offering peace of mind regarding quality.

Benefits

• Enhanced Handling: Improved vehicle dynamics, providing better driving confidence and a smoother feel.
• Better Stability: Improved stability for daily driving, off-roading, and touring.
• Reduced Steering Correction: No more constant steering adjustments or fighting lane assist features.
• Less Driver Fatigue: A more relaxed driving experience and reduced risk of accidents.
• Reduced Tire Wear: Better tire contact with the road, increasing tire life.

Why the Isuzu D-Max, MU-X & Mazda BT-50 Need This Product

These vehicles experience chronic bump steer, which leads to significant tire wear. This issue is apparent in both standard-height and lifted versions, but becomes more severe with lift modifications.

The KCA514 steering knuckle provides a direct replacement, replicating all original features and mounting provisions. Made from hot-forged 4140 AISI steel, it’s heat-treated and finished with black e-coat for optimal corrosion resistance.

Pairing KCA514 steering knuckles with upper control arms resolves premature tire wear, improves alignment, and restores proper handling.

Can Regular Wheel Alignments Fix the Issue?

No. While wheel alignments may temporarily reduce tire wear, they don’t fix the underlying problem. Alignments are a band-aid solution, not a permanent fix.

Alternative Fixes to Steering Knuckle

After extensive testing, we’ve learned that while an upper control arm may slightly improve bump steer, it doesn’t provide a full solution. Adjusting the steering rack pickup point is necessary to properly address bump steer. Using an upper control arm to fix bump steer would cause other issues, such as tire clearance problems.

The Whiteline steering knuckle is engineered to correct bump steer without introducing new complications.

What is Bump Steer?

Bump steer refers to changes in the vehicle’s toe as its ride height changes, especially when driving over bumps. This is particularly problematic when towing, carrying heavy loads, or using a suspension lift. Excessive bump steer causes premature tire wear, as demonstrated in real-world field tests and R&D.

How Does the Whiteline Steering Knuckle Help?

The Whiteline steering knuckle relocates the tie-rod pickup point to optimize the steering geometry and reduce bump steer across different ride heights. Testing shows a 75% reduction in bump steer when these knuckles are installed in lifted vehicles. When installed in standard-height vehicles, bump steer is reduced to nearly zero.

Combining the KCA514 knuckles with offset upper control arms can reduce bump steer by an additional 10-15%.

Product Stock

Please be advised that our stores do not hold any stock. In order to make sure things go as fast as possible you can purchase your parts online. If you would like to have your parts installed by us please choose Click & Fit at the checkout.

You can use the shipping calculator to find your shipping costs, your closest pick up or install locations. The shipping calculator will also show all shipping and installation prices. Shipping is free if you choose to get your item installed by us.

When our product stock levels are low, or current stock is allocated to orders, our website may show an ‘in-stock’ status when in fact the item might be sold out. We will advise within 48hrs; stock availability, order status and shipping details.

Delivery Methods

1. Select “Click & Fit” as a delivery method during the checkout process and you will be given a special fitted price to have both the product delivered and installed. A suspension expert will be assigned to your order, who will organise everything for you and will help you every step of the way. You can sit back and relax, knowing that your car is going to be looked after by suspension experts.

2. Select “Free Pickup” as a delivery method during the checkout process and you will be given free delivery to your nearest Fulcrum outlet where you can collect the parts. We will text and email you all your tracking details. 

3. Select “Deliver to Door” as a delivery method during the checkout process and we will deliver your order direct to your nominated delivery address. We will text and email you all your tracking details. 

Shipping

We offer FREE shipping to all metro areas (excluding WA, TAS and NT).

If you live on the Australian coast, that does not mean you are subject to free shipping.

Express shipping times and free shipping times are only to be counted once the order has been shipped from our warehouses. Our free shipping and express shipping services both have the same order processing times. We first have to raise the order, then we send it to one of our warehouses for processing and once ready it will be shipped from the warehouse. The difference between express and free shipping services, is the time it takes for the item to be transported from our warehouse to your address.

Our free shipping policy is determined by densely populated metro locations and the viability of distance travelled from our distribution centres. We are constantly expanding our warehousing, so areas covered by free shipping are subject to change. See our shipping policy here.

Returns

We guarantee the fitment and quality of our products, but if you choose to return an item we offer a generous 60 day returns policy. See our returns policy here.

Warranty

All products sold by Fulcrum Suspensions are covered by a national warranty. This products warranty is subject to conditions from the date of purchase, unless otherwise stated on the item.

Warranty claims must meet certain criteria and be sent to Fulcrum Suspensions with a receipt to be eligible for a refund. See full warranty claim criteria here.