Best Suspension Upgrades for the BMW F22 M235i & M240i (Road & Track Guide)

If your BMW F22 M235i or M240i feels fast in a straight line but nervous in corners, you're not alone. Factory suspension geometry and soft bushings limit front-end grip and rear stability - especially during fast road or track driving.

From our experience setting up the M235i and M240i for fast road and track use, the same themes appear repeatedly: limited front-end grip, vague steering under load, and rear axle movement when accelerating hard. 

The good news is that the core platform is excellent - it simply needs proper geometry and solid mountings to come alive. Below are key upgrades manufactured by Suspension Secrets in the UK that transform the F22 M235i/M240i chassis.

F22 Suspension & Handling Overview

The M235i was manufactured from 2014 to 2016 with an 'N55' straight-six turbo engine producing 326hp. The replacement M240i arrived in the summer of 2017 with a 340hp 'B58' motor, and continued in production until 2021. Six-speed manual and eight-speed automatic transmissions were available.

The F22 M235i and M240i use MacPherson strut front suspension and five-link independent rear suspension. Staggered 18- or 19-inch wheel and tyre setups could be teamed with Adaptive M dampers.

The layout itself is fundamentally strong, however BMW made compromises in the bushings, alignment settings and geometry control. BMW engineered these cars for daily comfort first, fast road driving second.

When driven enthusiastically, that compromise becomes obvious.

M235i & M240i Suspension Limitations

From our testing - both on road and track - the same traits repeatedly appear:

• Noticeable front-end understeer
  
• Limited factory camber adjustment
  
• Soft front control arm bushes affecting braking stability
  
• Rear axle movement under hard acceleration
  
• Inconsistent rear toe control
  
• Body roll during quick direction changes
  
• A slightly vague steering feel
  

None of these problems are dramatic in isolation. But when combined, they limit confidence when pushing on. The M235i and M240i feel quick in a straight line yet unsettled when really leaned on through corners.

The good news is that these issues can be resolved with bolt-on suspension upgrades.

Common Handling Problems (And How To Fix Them)

The BMW F22 M235i and M240i suspension upgrades detailed in this guide allow you to achieve the following…

F22 M235i / M240i Suspension Fixes
1. Increase front camber and significantly reduce understeer
2. Improve the clarity and weight of steering communication
3. Reduce unwanted geometry change caused by soft factory bushes
4. Stabilise rear toe under load and increase traction on corner exit
5. Enhance overall handling precision and consistency

With these changes implemented, the F22 chassis responds to steering, braking and throttle inputs far more enthusiastically. Turn-in becomes sharper, the front axle generates more grip mid-corner, and the rear feels much more planted.

BMW F22 M235i & M240i Suspension Geometry & Alignment Setup (Top Tip)

Before fitting a single part, the most important step is a proper geometry setup.

BMW’s factory alignment settings are conservative. They’re designed for tyre longevity, ride comfort and broad market appeal rather than enthusiastic driving.

Benefits of a professional fast-road or track alignment:

• Increased front negative camber
• Optimised rear toe settings
• Correctly balanced chassis side-to-side
• Maximised caster angle (where possible)

Corrected geometry improves turn-in response, reduces understeer and enhances steering feel. It also increases traction on corner exit and improves tyre wear consistency.

Even on a completely standard M235i or M240i, corrected alignment alone makes a noticeable difference. However, you need more adjustment range than the factory provides to fully unlock grip.

Essential BMW M235i & M240i Suspension Upgrades

This section covers essential BMW F22 M235i and M240i suspension upgrades that serve as a great first step in your pursuit of handling improvements. These upgrades form the basis of Suspension Secrets handling packages and are the ideal starting point for both road and track-focused builds.

Adjustable Camber & Caster Plates

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Benefits of M235i & M240i Camber Plates

• Sharper turn-in
• More front end grip mid-corner
• Reduced outer tyre shoulder wear
• Increased steering feedback
  

When combined with the increased caster manufactured into our camber plates, you also gain dynamic camber as steering lock is applied. The steering becomes more communicative and weighted - something these cars benefit from greatly.

For fast road use, moderate camber works beautifully. For track use, higher camber settings transform consistency and front-end bite.

 

Solid Front Control Arm Bushes

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One of the biggest hidden weaknesses in the F22 chassis is the front bushes.

BMW fitted soft rubber, oil-filled bushes in the front lower control arms. Under braking and cornering loads, these bushes flex. That deflection changes suspension geometry dynamically, which is why the car can feel slightly vague under heavy braking or initial turn-in.

Replacing them with Suspension Secrets Solid Front Control Arm Bushes eliminates that unwanted movement.

Solid Bushes Improve

• Braking stability
• Steering precision
• Consistency under load
• Front end confidence

The steering feels more direct. The car holds its geometry instead of moving around on soft rubber. For fast road cars, this is one of the most worthwhile upgrades you can make.

 

Adjustable Rear Toe Arms

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If there’s one area that causes rear-end nervousness in the M235i and M240i, it’s rear toe compliance.

The factory rear toe arms use soft bushes that allow the rear wheels to steer slightly under load. When accelerating out of a corner, that movement can make the rear feel unsettled.

Solid-mounted adjustable rear toe arms from Suspension Secrets solve this issue completely.

What Rear Toe Arms Fix

• Maintain consistent alignment under load
• Improve traction on corner exit
• Reduce rear steer effect
• Increase confidence on throttle

Once fitted and correctly aligned, the F22 rear axle feels far more planted and predictable - particularly on the more powerful M240i models.

M235i & M240i Suspension Packages Explained

For owners wanting to overhaul the chassis, Suspension Secrets offers three staged handling packages, plus a full kinematics solution for serious builds.

 

Handling Pack 1 (Fast Road)

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Designed for fast road use, this package focuses on eliminating the most significant compliance issues while retaining daily usability.

This package includes:

• Adjustable camber plates
• Solid front control arm bushes
• Adjustable rear toe arms
• Supporting components to optimise geometry
• Lowering springs or coilovers (if required)

Best For: Enhancing handling performance on the road

 

Handling Pack 2 (Clubsport)

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This is aimed at drivers who regularly attend trackdays but still drive the car on the road. This M235i/M240i suspension upgrades achieves greater body control, increased camber range and improved balance under sustained load.

The package includes:

• Choice of 1.5-way or 2-way adjustable coilovers
• Adjustable camber plates
• Front & rear drop links
• Solid front control arm bushes
• Adjustable rear toe arms
• Adjustable rear upper camber arms
• Rear upper third link arms
• Solid rear control arm bushes

Best For: Cars used on the road and track

 

Handling Pack 3 (Track)

BUY HERE

Handling Pack 3 is for serious circuit use. This comprehensive kit removes all unwanted compliance in the M235i/M240i suspension system and provides full geometry adjustment front and rear.

The result is consistent tyre contact under heavy load and precise chassis balance at high speeds.

This package includes:

• Choice of adjustable coilovers
• Adjustable rear toe arms
• Off-centre caster control arm bushes
  
• H&R anti-roll bars
  
• Adjustable rear upper camber arms
  
• Rear upper third link arms
  
• Adjustable rear traction arms
  
• Solid rear control arm bushes

Best For: Driving on circuit with semi-slick and slick tyres

 

Full Kinematics Kit

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The package includes:

• Adjustable rear toe arms
  
• Adjustable rear camber arms
  
• Adjustable rear traction arms
  
• Solid rear control arm bushes
  
• Solid front offset caster bushes
  
• Adjustable rear upper third links

Best For: The ultimate chassis upgrade for serious track drivers.

 

BMW F22 M235i & M240i Suspension FAQs

Why do the M235i and M240i understeer from the factory?
The standard cars don’t run enough front negative camber, and the soft rubber front bushes allow geometry to change under load. When cornering hard, the outside front tyre rolls onto its outer shoulder, reducing grip and creating understeer.

What’s the most cost-effective handling upgrade?
A professional suspension geometry alignment. Increasing front negative camber and optimising rear toe settings immediately improves turn-in, traction and steering feel - even on completely standard components.

Why does the rear feel nervous under acceleration?
The factory rear toe arms use soft rubber bushes, which allow the rear wheels to steer slightly under load. This causes instability when applying throttle. Solid-mounted adjustable rear toe arms eliminate that unwanted movement and make the rear axle feel planted and predictable.

Are solid front control arm bushes worth it for road cars?
Absolutely. The standard oil-filled bushes flex under braking and cornering, which affects steering precision and stability. Solid bushes dramatically improve braking confidence, steering accuracy and consistency without compromising daily drivability.

Which handling package should I choose?

• Handling Pack 1 is ideal for fast road driving.
  

• Handling Pack 2 suits cars used regularly on both road and track.
  

• Handling Pack 3 is designed for serious circuit use with semi-slicks or slicks.
  

• The Full Kinematics Kit is the ultimate upgrade for drivers wanting complete geometry control and maximum chassis precision.
  
  

Developed and manufactured by Suspension Secrets, these F2x M235i and M240i suspension upgrades unlock a new level of handling performance.