ST XA Coilovers for BMW 1 Series M135i F20/F21 (2011+) RWD/2WD Non-EDC (non-adaptive) – Height & Rebound Adjustable Performance Suspension/Lowering Kit, Adjustable Shocks & Springs, Ride Height Coilover Set by ST Suspensions KW Technology

ST XA Adjustable Suspension for BMW 1 Series M135i F20 F21 RWD 2011 onward, non EDC

Unlock sharper handling, confident braking and a purposeful drop with the ST XA adjustable shock and spring system for the BMW 1 Series M135i. Co-developed with KW, this premium coilover suspension gives you precise rebound tuning and on-car ride height adjustment, delivering taut road manners, flatter cornering and a stance that looks as good as it drives.

Built for F20 and F21 M135i rear-wheel-drive models without electronic damping control, the kit combines KW twin-tube damper technology with corrosion-resistant, galvanised bodies, high quality seals and durable spring perches. Ideal for fast road use, spirited B-road blasts and occasional track time, it strikes a clever balance between day-to-day comfort and performance-focused control on UK tarmac.

Why this upgrade

• Rebound adjustability via the top of the piston rod, so you can quickly fine tune road feel and compliance
• Threaded bodies for front and rear ride height adjustment that lets you dial in the perfect stance
• Noticeably reduced body roll, crisper turn in and greater mid-corner stability
• KW engineered twin-tube dampers with low friction internals for consistent performance
• Galvanised struts with additional coating for strong corrosion protection in British weather
• Complete package including performance springs, adjustable seats, bump stops and dust boots

Lowering capability

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

Actual drop depends on vehicle spec and axle loads. Check your VIN plate for max axle weights, typically the third number for the front axle and the fourth for the rear.

Fitment

• BMW 1 Series M135i F20 and F21, rear wheel drive, 2011 onward
• Not suitable for vehicles with electronic damper control EDC
• With some OE wheel and tyre combinations, spacers may be required for inner clearance

What you will notice

Cleaner responses to steering input, a calmer chassis over undulations and a planted, composed feel when pressing on. Increase rebound for extra control and road feedback, or soften for daily comfort. We have fitted and driven cars on this setup, and our customers consistently praise the ride quality, stance and confidence it brings to the M135i.

Installation and alignment

Professional fitting with a full four wheel alignment is strongly recommended for best results. MJ Modifications in Warwickshire can install and set up your kit to your driving style. Request a fitting quote at info@mjmodifications.co.uk.

Notes

• Not compatible with vehicles equipped with EDC electronic dampers
• Wheel spacers may be necessary depending on wheel and tyre setup
• Always confirm axle loads on your VIN plate before ordering

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Order your ST XA adjustable coilover suspension today and transform the way your BMW M135i looks and drives, with precision tuning and everyday usability built in.