KW Street Comfort Height Adjustable Coilover Kit for BMW 1 Series M135i/M140i (F20/F21) xDrive 4WD with Electronic Dampers (EDC) - 16-Click Rebound, 20-45mm Lowering, Inox-Line Stainless | Models 1K2, 1K4

Comfort-first height adjustable suspension for BMW 1 Series M135i and M140i F20 F21 xDrive with electronic damper control

Give your BMW hot hatch the road manners it deserves. This premium comfort-oriented coilover suspension transforms everyday driving on UK roads, delivering a supple ride, tidy body control and a tasteful drop for a smarter stance. If your factory setup or an older aftermarket kit feels crashy, this kit brings the balance back with genuinely refined compliance and confidence.

At MJ Modifications we have fitted this kit on customer M135i and M140i cars and the feedback has been consistently excellent. Owners report smoother commuting, calmer motorway miles and more composed B-road pace. It is the ideal solution for drivers who want comfort without losing grip or steering precision.

Key benefits

• Comfort-focused damping for UK tarmac while keeping sharp handling for spirited drives
• 16-stage rebound adjustment so you can fine tune firmness to suit tyres, wheels and driving style
• Ride height adjustment for a subtle 20 to 45 mm drop front and rear
• Inox stainless damper bodies for outstanding corrosion resistance and long life
• Vehicle-specific spring and damper rates developed and validated on road and 7-post test rig
• Durable trapezoidal threads and composite spring perches designed to keep adjustments smooth over time
• Great with larger wheel and tyre setups thanks to easy rebound tuning

Lowering 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

Compatibility

• BMW 1 Series M135i and M140i
• F20 and F21 chassis
• xDrive all wheel drive vehicles with electronic dampers
• Model codes: 1K2, 1K4

How it feels on the road

Use the 16-click rebound adjuster to dial in comfort or extra tautness. Turn it up for tighter body control, cleaner turn-in and increased stability. Back it off for rougher surfaces and daily use. The adjustment is quick and repeatable, helping you get the most from your tyres and alignment without spoiling ride quality.

Built for the long haul

The inox stainless construction shrugs off British weather, salted roads and year-round driving. Threads stay usable, height changes remain easy and the damping stays consistent. It is a premium road-biased system engineered to enhance comfort, control and confidence.

Professional fitting and setup

For installation and geometry setup, book with MJ Modifications in Warwickshire. Our technicians have extensive experience with BMW F20 and F21 platforms and this comfort suspension. Request a fitting quote: info@mjmodifications.co.uk.

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