KW Variant 1 V1 Coilovers for BMW 1 Series M135i/M140i F20 F21 RWD – Adjustable Lowering Suspension Kit, Ride-Height Adjustable inox-line Stainless Coilover Shocks & Springs – EDC/Adaptive Damper Compatible (1K2, 1K4)

Height-adjustable suspension upgrade for BMW M135i and M140i F20 F21 with factory adaptive dampers

Looking to sharpen turn in, reduce body roll and achieve that perfect arch-to-tyre fitment on your BMW hot hatch? This KW Variant 1 inox-line coilover system delivers a precise ride-height drop and a balanced, road-friendly handling setup that transforms confidence without ruining comfort. It is ideal for daily driving, spirited B-road runs and fast road use where you want a tidy stance and a planted feel.

At MJ Modifications we have installed these kits on customer cars and our feedback is consistent every time: crisp steering, flatter cornering, better traction out of bends and a clean, even drop that looks right and drives brilliantly. The fixed-rate damping is pre-set by KW engineers specifically for this platform, so you get the sweet spot straight out of the box.

Fitment and reference codes

• Vehicle compatibility: BMW 1 Series M135i and M140i, F20 and F21, two-wheel drive models with factory electronic damper control EDC
• KW fitment codes: 1K2, 1K4
• Front axle load range: 921 to 1090 kg
• Rear axle load: up to 1230 kg

Lowering range

• Front: 25 to 50 mm
• Rear: 30 to 55 mm

Why enthusiasts choose this setup

• Ride height adjustability for dialled-in stance, arch gap control and corner weighting
• Factory pre-configured damping for the M135i and M140i chassis that balances comfort with performance
• Stainless steel strut housings inox-line for long-term corrosion resistance on UK roads
• Durable composite spring perches and dirt-resistant trapezoid threads for easy height changes
• Improved body control, reduced squat and dive, and a more planted rear end
• Complete spring and damper kit with vehicle-specific components for straightforward installation
• Engineered and tested in Germany to a high quality standard

What is included

• Complete KW Variant 1 inox-line coilover system
• Matched springs and dampers front and rear
• Height adjustment hardware as applicable
• Bump stops and all required ancillary parts
• Full installation documentation

Everyday drivability with real performance gains

Expect flatter cornering, direct steering response and a calmer, more composed chassis over rough tarmac. Ride comfort remains fully usable for commuting and long journeys, while the lower centre of gravity enhances stability and grip.

Built to last

Inox-line stainless construction resists corrosion, making this kit ideal for UK weather and year-round use. The robust thread design and composite adjusters make height changes simple, even after many miles.

Warranty

2-year manufacturer warranty as standard, extendable to 5 years when installed by a KW specialist dealer, subject to terms.

Professional fitting and setup

We recommend professional installation and alignment. MJ Modifications offers supply and fitting at our Warwickshire workshop with geometry setup for road or fast-road use. Request a fitting quote at info@mjmodifications.co.uk.

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