KW Street Comfort Coilover Suspension Kit for BMW 1 Series M135i/M140i (F20/F21) xDrive AWD 4WD - Height & 16-Click Rebound Adjustable - Non-EDC/No Adaptive Dampers - Inox-Line Stainless Steel - Adjustable Shocks & Springs - 1K2/1K4

Comfort-focused adjustable suspension for BMW 1 Series M135i and M140i F20 F21 xDrive, cars without adaptive damping

Make your daily BMW feel refined without giving up road-holding. This KW comfort-orientated coilover suspension set transforms the M135i and M140i into a smoother, calmer, more composed 1 Series that still feels sharp when you want it to. Ideal for UK motorways and B-roads, it takes the edge off harsh surfaces while tightening body control and steering precision. If you want premium ride quality with genuine driver confidence, this is the road-friendly coilover kit to choose.

• Vehicle compatibility: BMW 1 Series M135i and M140i, F20 and F21, xDrive all-wheel drive, for cars without factory adaptive or electronic damping
• Chassis references: 1K2 and 1K4
• Ride height adjustment range: Front 20 to 45 mm, Rear 20 to 45 mm
• Maximum permitted axle loads: Front 1001 to 1020 kg, Rear up to 1120 kg

What you will feel on the road

Less crashy over broken tarmac. Fewer jolts over potholes. Better composure at speed. With the 16-stage rebound adjustment you can fine-tune damping force for plush comfort or dial in extra control for spirited drives. The result is a 1 Series that rides with maturity, corners flatter and stays settled over undulations, yet remains easy to live with every day.

Highlights and tech

• Comfort-biased damper tuning for everyday use with enhanced stability and reduced body movement
• 16-click rebound control to tailor firmness and support to your driving style, wheels and tyres
• Stainless steel damper bodies for long-term corrosion resistance in UK weather
• Precise ride height adjustment front and rear within 20 to 45 mm
• Durable threaded bodies with composite spring seats for easy adjustments, season after season
• Works brilliantly for commuting, long motorway journeys and fast B-road drives

Why BMW owners choose this setup

It is the sweet spot between comfort and control. You get a premium, quiet, well-damped ride with the ability to tweak rebound for different routes, passengers or wheel and tyre changes. Our customers consistently praise the calmer cabin, improved traction and the confidence it gives on poor surfaces.

Fitment notes

• For BMW F20 and F21 M135i and M140i with xDrive four-wheel drive
• Suitable for vehicles without electronic damping control or adaptive shocks
• Check your vehicle’s axle loads are within the limits listed above

Installation and setup

Professional fitting and a quality four-wheel alignment are strongly recommended for the best results. MJ Modifications offers expert installation, corner-height setup and guidance on rebound settings at our Warwickshire workshop. Request a fitting quote at info@mjmodifications.co.uk.

Trusted by us and our customers

We have installed this comfort coilover system on multiple customer M135i and M140i builds. Feedback is consistently positive on ride comfort, road refinement and confidence on uneven surfaces. It is our go-to recommendation for owners who want a premium suspension upgrade for real-world driving.

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