Suspension Secrets Adjustable Camber & Caster Plates - BMW F20 M135i/M140i
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Suspension Secrets Adjustable Camber & Caster Plates – BMW F20 M135i / M140i
Increase front-end grip, reduce understeer and gain far greater control over your suspension geometry with Suspension Secrets Adjustable Camber & Caster Plates for the BMW F20 M135i and M140i.
As standard, the F20 does not offer useful front camber adjustment. This can limit how effectively the front tyres work during harder cornering, particularly on lowered cars, fast-road builds and track-focused setups.
Suspension Secrets Adjustable Camber & Caster Plates provide independent geometry adjustment at the top mount, allowing the front axle to be tuned far more precisely around tyre choice, ride height and intended use.
Why Upgrade to Adjustable Camber & Caster Plates?
The standard F20 front suspension offers very limited geometry adjustment.
These camber and caster plates allow you to introduce a more performance-focused alignment while retaining much greater control over the final setup.
Potential benefits include:
- Fully adjustable front camber
- Additional caster adjustment
- Increased front axle grip
- Reduced understeer
- Improved steering feel
- Better high-speed stability
- Improved dynamic camber gain
- More precise geometry setup
- Reduced tyre wear when correctly configured
Key Features
- Designed for BMW F20 M135i and M140i
- Fully adjustable camber
- Secondary caster-adjustable position
- Increases positive caster
- Helps reduce understeer
- Increases front-end grip
- Improves steering feel
- Improves high-speed stability
- Notched grooves help prevent adjustment slip
- Reinforced Rodoball bearings
- Compatible with OEM suspension
- Compatible with aftermarket suspension using OEM-style top mounts
- Fits all F20-generation BMW 1 Series variants
- Billet aircraft-grade 6082 T6 aluminium construction
- Corrosion-resistant stainless steel components
- Motorsport-spec Fluro bearings
- Designed and manufactured in the UK
The Limitation of Standard Front Camber
The factory F20 suspension does not provide meaningful front camber adjustment.
For performance driving, this can restrict the ability to keep the outside front tyre working effectively during cornering.
As cornering loads increase, additional negative camber can help maintain a better tyre contact patch and reduce excessive loading of the tyre's outer edge.
Fully Adjustable Front Camber
The Suspension Secrets plates allow the front camber setting to be adjusted rather than relying on a fixed increase.
This gives much greater flexibility when setting the car up for:
- Road use
- Fast-road driving
- Trackdays
- Semi-slick tyres
- Different ride heights
- Different chassis balance preferences
Reduced Understeer
One of the main benefits of additional front negative camber is improved front tyre utilisation during cornering.
When correctly configured, this can result in:
- Increased front-end grip
- Reduced understeer
- Improved turn-in
- Better mid-corner confidence
- More consistent steering response
More Balanced Than a Fixed Camber Solution
A popular F20 modification is to install front control arms from the BMW F82 M4.
These can provide additional front camber, but the increase is fixed and can also alter the front track width.
Suspension Secrets developed its adjustable camber plates to give the driver greater control over the front geometry instead of relying on a predetermined setting.
This allows the front axle to be balanced more carefully against the rear suspension setup.
Adjustable Caster
The plates also feature a secondary caster-adjustable position.
This allows additional positive caster to be introduced into the front suspension geometry.
Increasing positive caster can help improve:
- Steering feel
- Steering self-centring
- High-speed stability
- Cornering grip
- Dynamic camber gain
Improved Dynamic Camber Gain
Positive caster affects the way front camber changes as steering angle is added.
As the outside wheel turns into a corner, additional caster can generate more useful negative camber dynamically.
This can help maintain a better tyre contact patch during cornering and further improve front-end grip.
Improved Steering Feel
Additional caster can also increase steering weight and feedback.
For performance-focused drivers, this can create:
- More communicative steering
- Greater front-end confidence
- More predictable behaviour
- Better connection to the front tyres
Improved High-Speed Stability
Caster also plays an important role in straight-line and high-speed stability.
Increasing positive caster can help the steering return more naturally towards centre and provide greater confidence at speed.
Notched Adjustment Grooves
The camber adjustment mechanism uses notched grooves designed to help prevent the selected setting from moving during high-speed driving.
This helps maintain more consistent geometry under demanding conditions.
Reinforced Rodoball Bearings
The plates use reinforced Rodoball bearings for improved precision and durability.
These help provide accurate strut movement while reducing unwanted compliance in the top-mount assembly.
Reduced Front Tyre Wear
Although aggressive camber settings can increase inner-edge wear in some circumstances, insufficient camber during track driving can heavily overload the outside edge of the front tyres.
The additional adjustment range allows the geometry to be matched more accurately to the intended use of the car.
When correctly configured, this can result in more even tyre usage during hard cornering.
Compatible With OEM Suspension
The Suspension Secrets camber and caster plates are compatible with the original suspension arrangement.
This makes them suitable for drivers who want additional geometry adjustment without immediately replacing the dampers or springs.
Compatible With OEM-Style Aftermarket Suspension
The plates are also compatible with aftermarket suspension systems designed to retain the factory-style top mounts.
Examples include:
- KW V3
- Bilstein B16
- Öhlins Road & Track
- Other compatible OEM-top-mount suspension systems
Exact compatibility should always be checked before ordering.
Important Coilover Compatibility Note
These camber plates are not designed for coilover kits using 60mm internal-diameter springs and their own dedicated motorsport-style top mounts.
They are intended for:
- OEM suspension
- Coilovers designed to use the OEM top mount arrangement
If your coilovers use 60mm ID springs and dedicated top mounts, these plates may not be suitable.
Works Well With Other Geometry Upgrades
The camber and caster plates pair particularly well with:
- Coilovers
- Lowering springs
- Adjustable front drop links
- Offset caster bushes
- Adjustable rear camber arms
- Adjustable rear toe arms
- Performance geometry setups
Road & Track Applications
These plates are suitable for a wide range of builds, including:
- Fast-road cars
- Clubsport builds
- Trackday cars
- Performance road cars
- Cars running semi-slick tyres
The adjustability allows the geometry to be configured around the intended use rather than locking the car into one fixed setup.
NVH Considerations
Because these plates use motorsport-oriented bearing construction rather than a conventional soft rubber top mount, some increase in noise, vibration or harshness may be possible compared with the standard arrangement.
This is a performance-focused component intended to prioritise geometry control and steering precision.
Professional Installation Recommended
Professional installation is recommended.
After fitting, the vehicle should receive:
- Suspension inspection
- Camber adjustment
- Caster adjustment
- Toe adjustment
- Steering clearance checks
- Full wheel alignment
Geometry Setup Essential
A professional geometry setup is strongly recommended after installation.
Camber, caster and toe should be configured together to suit:
- Road or track use
- Ride height
- Tyre choice
- Suspension specification
- Desired handling balance
Vehicle Fitment
BMW 1 Series F20
Compatible with:
- BMW M135i F20
- BMW M140i F20
- Other F20-generation BMW 1 Series variants
What's Included?
Each kit includes:
- 1 pair Suspension Secrets Adjustable Camber & Caster Plates
Explore More BMW F20 Suspension
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Suspension Secrets – Browse the wider Suspension Secrets chassis and geometry range.
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