SuperPro TRC6680 Steering Knuckle – Eliminate Bump Steer the Right Way
The SuperPro TRC6680 Steering Knuckle is the ultimate solution for bump steer issues affecting
all 2019-onwards Isuzu D-Max, MU-X, and Mazda BT-50 models, delivering improved handling, tyre life, and alignment precision.
Isuzu and Mazda’s 2024 suspension update for the D-Max, MU-X, and BT-50 has only solved around
45% of the bump steer problem. That means drivers are still left dealing with:
- Premature tyre wear
- Inconsistent wheel alignment
- Unstable handling, especially when lifted or loaded
The SuperPro TRC6680 steering knuckle and TRC6590 upper control arm are the complete fix—engineered to reduce bump steer by up to
95%, improving handling, alignment, and tyre life, whether your vehicle is at standard height or lifted.
Why TRC6680?
- Fixes the real cause of bump steer by raising the steering rack pickup point—something upper control arms alone can’t do
- Reduces tyre wear and improves contact with the road
- Enhances driving stability, comfort, and safety
- Suitable for standard and lifted vehicles
- Direct OE-style fitment – no modifications required
Manufactured from hot-forged
4140 AISI steel, heat-treated and black e-coated for durability and corrosion resistance.
Legal & Fully Compliant
✅
VSB14 Approved – No engineer sign-off or mod plate needed
✅
ADR Compliant – Meets OE design standards
✅ Tested to
1650kg front axle loads using FEA analysis
✅ Suitable for use with
any GVM upgradeThis product installs just like a control arm, spring, or shock—simple and legal.
Common Questions
Can wheel alignments fix bump steer?
No. Regular alignments might reduce tyre wear temporarily but don’t fix the core issue.
Can an upper control arm alone solve this?
No. It can help, but not enough. Designing a UCA to completely fix bump steer would create
caster and clearance issues. That’s why
steering knuckles are essential.
Why Bump Steer Matters
Bump steer causes your wheels to toe in or out as your suspension moves—especially with added weight or a lift kit. This leads to:
- Tyres wearing out quickly
- A steering wheel that constantly needs correcting
- Fatigue from fighting the car’s handling
Proven, Tested, Trusted
The TRC6680 has been tested by SuperPro’s engineers and independent assessors to exceed strength and compliance standards. It’s built to perform and last.
Pair it with the TRC6590 upper control arm to fully restore proper geometry and feel the difference immediately.
*All prices shown on the Formula 4x4 website include GST. You will not be charged any additional fees related to tax.
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.
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.
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.
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.
Click & Fit Guideline
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 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.
Your assigned suspension expert will confirm all the details for your booking. Your parts will then be delivered to your closest Fulcrum workshop and an installation date will be booked based on your preference. You then bring your car on the booking date and the Fulcrum workshop will install your order.
Installation includes full product installation by a qualified technician, a full wheel alignment, a complete suspension check, a visual brake inspection, and a complete report. We also offer a complimentary 1000km check-up service, which includes a suspension check and any retention work, your alignment and tyre wear will also be checked. If we find that anything needs to be amended during our 1000km check, we will carry out this work free of charge. This includes a wheel alignment, if required. Please note that Fulcrum Dealers are independant workshops and may not supply a full suspension report or offer a 1000km checkup. Workshops that are owned by Fulcrum Suspensions will do this for you though.
Throughout your order, installation, and service. You will be kept up to date every step of the way. Fulcrum offers this service to ensure you get the best possible experience.
