Performance M
STXA Coilover Kit - 1-series M135i / M140i (F20, F21); (1K2, 1K4) 2WD; without electronic dampers 09/11-
STXA Coilover Kit - 1-series M135i / M140i (F20, F21); (1K2, 1K4) 2WD; without electronic dampers 09/11-
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Transform your BMW 1 Series handling with adjustable performance suspension
Unlock sharper turn in, reduced body movement and a purposeful stance on your BMW M135i or M140i with this height and rebound adjustable suspension kit, designed for the F20 and F21 rear wheel drive platforms from 09/2011 onward. Suitable for cars without adaptive damping (non EDC, non electronic dampers). Chassis codes 1K2 and 1K4 supported.
Why enthusiasts choose this setup
- Rebound adjustable shocks using KW Automotive technology for fast road and track day confidence
- Precise ride height tuning on threaded struts for the perfect stance and corner balance
- Twin tube damper construction and low friction internals for consistent, predictable control
- Galvanised bodies with additional coating plus dust boots for long term corrosion protection
- TUV tested adjustment range for peace of mind
Lowering range and axle ratings
- Front drop: 25 to 50 mm
- Rear drop: 30 to 55 mm
- Front axle load: 921 to 1,090 kg
- Rear axle load: up to 1,230 kg
Real world results
Expect tighter body control, improved stability at speed and a more agile feel without ruining daily comfort. Increase rebound for a firmer, more planted drive on smooth tarmac or back it off for compliant road manners on rougher surfaces. We have fitted and run this setup on multiple customer cars and the feedback has been consistently excellent for fast road use and occasional track time.
Built for UK roads and weather
The externally adjustable rebound is accessible at the top of the piston rod for quick changes. The continuously threaded spring perch lets you fine tune the ride height even after installation. Durable, corrosion resistant struts handle year round driving in British conditions.
Compatibility
- BMW 1 Series M135i and M140i
- F20 and F21 RWD models only
- For vehicles without electronic damper control
- Chassis codes: 1K2 and 1K4
- Model years from 09/2011 onward
Professional fitting available
For installation, setup and alignment, choose MJ Modifications in Warwickshire. We offer expert fitting, ride height setup and post install geometry. Request a quote: info@mjmodifications.co.uk.
Search friendly terms
BMW 1 Series F20 suspension upgrade; F21 coilover suspension; M135i lowering springs and shocks; M140i adjustable shocks; fast road suspension kit; rebound adjustable dampers; height adjustable suspension; threaded body struts; KW engineered coilovers; non EDC suspension kit; BMW RWD performance suspension; UK road and track suspension; stance and handling upgrade.
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