Suspension Secrets

Suspension Secrets Solid Front Control Arm Bushes - BMW F90 M5

£245.00

Including Taxes

In Stock

Lifetime Warranty Included

Lifetime Warranty Included

Free Worldwide Shipping

Free Worldwide Shipping

Technical Support Available

Technical Support Available

Improve braking stability and steering accuracy by installing the Suspension Secrets Solid Front Control Arm Bush for the BMW F90 M5

The standard BMW front control arm bushes are made from soft rubber. This rubber flexes when driving fast, causing the steering to feel vague at the limit. These rubber bushes also flex when braking hard leading your M5 to feel nervous or unstable.

To solve both of these problems, solid front control arm bushes are required. Our solid bushes are designed as press-fit replacement for the OEM BMW control arm bushes. As our bushes are solid, they eliminate all of the issues caused by soft rubber bushes. Instead you gain improved braking stability and steering accuracy at the limit.

The key benefits of our Suspension Secrets Solid Front Control Arm Bush for the BMW F90 M5 are:

  • Increased braking stability
  • Improved steering feel and accuracy
  • Reduced understeer
  • Increased sense of connection to the road
Suspension Secrets' products are designed and manufactured in the UK. Our products are made from billet aircraft-grade 6082 T6 aluminium and corrosion-resistant 316 stainless steel. Our solid control arm bushes use Lemforder bearings for maximum performance and longevity.

    Geometry Explained

    As standard, the OEM rubber bushes used by BMW are quite soft. They are built for refinement, flexibility and durability. Rubber bushes are quiet and are ideal for a car that is designed to be used frequently. 

    Unfortunately, when used in a performance application, rubber bushes have quite a few downsides. When braking hard, the OE rubber bushes flex. They flex so much that the wheel assembly moves rearwards as the car brakes. This causes unwanted toe geometry change which causes the car to feel very nervous and vague when braking.

    The flex in rubber bushes also causes understeer and the steering wheel to feel very inaccurate during cornering.

    Toe

    Toe is the angle between each wheel with relation to the longitudinal axis of the vehicle. The animation below illustrates to toe-in, toe-out and zero toe.

    There are three types of toe: toe-in, toe-out and zero toe. Each toe setting has a separate purpose and an impact upon directional stability when used on a car. Toe has an effect on three major areas which are: corner entry handling, tyre wear and straight line stability.



    Toe-In
    On the front axle of a car toe-in creates straight-line stability, albeit at the expense of some initial reluctance from the car at during the corner turn-in phase. Toe-in on the rear axle again improves straight-line stability, but also induces a slight amount of slip angle which helps when putting power to the ground.

    Toe-in is more common for fast road use.


    Toe-Out
    On the front axle of a car toe-out creates instability in a straight-line. At speed, when a wheel with toe-out is turned, the wheel is pulled rearwards which increases the toe-out angle, pulling the wheel even more outwards. This can even pull the car into yaw. Front axle toe-out can make a car twitchy and unpredictable at high speeds.

    Toe-out does improve turn-in into corners, and the responsiveness of the front end.

    Toe-out on the rear axle can create a slip angle which allows for more traction and acceleration, but with a rear-wheel drive chassis it can also lead to unwanted levels of oversteer.


    Front-axle toe-out is more commonly used for track day or racing applications.

    Zero Toe
    Running zero toe on either the front or rear axles results in minimum tyre wear and power loss. This is because running any level of toe, no matter how small, causes the tyre to scrub in a straight line due to the incurred slip angle, which reduces the rolling efficiency of the tyre.

    Zero toe does not improve handling or feedback, nor does it create slip angle - all of which are desirable in performance driving - and as a result either toe-in or toe-out are more commonly chosen depending on use.

    Product Development

    All Suspension Secrets upgrades are designed, developed and manufactured in-house. This process includes prototyping new products using CAD and 3D printing technology, and extensive rear-world testing with professional racing drivers. Sophisticated motorsport data capturing equipment allows us to measure the handling performance gains achieved by our parts.

    Delivery and returns

    All parts purchased on our website are shipped internationally free of charge. We accept return requests made within 14 days of receipt of the item.

    Need help with something?
    Email: sales@suspensionsecrets.co.uk

    Tech Specs

    Suspension Secrets F90 M5 Solid Suspension Bushes are designed and manufactured in the UK. The bushes are CNC-machined from billet 6082 T6 aluminium, and the rubber inserts are sourced from a renowned high-performance OE manufacturer.

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    What our customers say.

    Real feedback from customers who have transformed the handling of their cars with Suspension Secrets upgrades.

    G87 M2 Handling transformation

    Supplied and fitted by the team at Suspension Secrets along side their solid front control arm bushes and Eibach Pro springs. I cant recommend this enough, stability and grip are ...
    Supplied and fitted by the team at Suspension Secrets along side their solid front control arm bushes and Eibach Pro springs. I cant recommend this enough, stability and grip are on another level. A* service provided by the team from start to finish. Highly recommended!

    - A.J.S

    Effortless & Accurate

    The results have exceeded my expectations, I'm really pleased with the car. The ride is similar to stock but it's taken the jitteryness away over small ripples in the road. ...
    The results have exceeded my expectations, I'm really pleased with the car. The ride is similar to stock but it's taken the jitteryness away over small ripples in the road. I was slightly apprehensive that the stock dampers might be exposed but I needn't have worried, the car rides exactly as I'd expect & want from a roadgoing M-car. The real revelation is the steering, I could feel the difference as soon as I turned out of your premises. Gone is the sluggish, heavy response - it's now quick, effortless & accurate, almost as if the power steering had been switched off beforehand. The car feels like it's 200kg lighter but at the same time, more solid & composed. For me, it's a perfectly-judged road setup - thanks again

    - Glenn C.

    Transformational

    Recently bought a 2025 M3 LCI which seemed ok out of the box. In the wet there was quite bad understeer and slightly unpredictable transition into oversteer. The CS+ handling ...
    Recently bought a 2025 M3 LCI which seemed ok out of the box. In the wet there was quite bad understeer and slightly unpredictable transition into oversteer. The CS+ handling package transformed the car. The grip is ridiculous, feel is improved, can really lean on the car. Driving in the wet traction is like it’s dry, extremely stable. Car is predictable, any transition to understeer or oversteer is communicated and feels like slow motion with plenty of time to correct. Feel like all the handling of a CS car with all the comfort or a regular M car. Absolutely love the car now.

    - Yaqub A.