H&R Anti-Roll Bar / Sway Bar Kit BMW 1 Series F20 F21 (RWD/2WD, 6-Cyl) M135i M140i 2011+ | Front 28mm Adj + Rear 20mm | ARB Stabiliser Handling Upgrade Typ 1K2/1K4

Transform how your BMW 1 Series handles with this premium sway bar set

Looking for flatter cornering, sharper turn in and serious chassis control on fast road or track days? This H&R stabiliser bar upgrade delivers a big step forward in grip, balance and confidence for the BMW 1 Series F20 and F21 six-cylinder rear wheel drive models, including M135i and M140i, 10/11 onward. Expect reduced body movement, more precise steering and a calm, planted feel through quick direction changes.

Fitment

BMW 1 Series F20 and F21, Typ 1K2 and 1K4, 2WD, all six-cylinder versions including M135i 2WD and M140i 2WD, 10/11 onward.

Technical details

• Front diameter: 28 mm, two-position adjustable
• Rear diameter: 20 mm, fixed rate
• TÜV approved

Why this upgrade

• Significantly reduces chassis roll for flatter, faster cornering
• Improves turn in and steering precision, boosts driver confidence
• Balances understeer and oversteer for a neutral, predictable setup
• Enhances tyre contact and traction without spoiling everyday comfort
• Ideal for fast road, spirited B-road driving and track use

Engineering you can trust

• Manufactured in Germany from high-grade steel alloy
• Single-piece construction with no welded joints for maximum strength
• Cold formed then heat treated for durability and consistent performance

Real-world results

We run these sway bars on our own builds and customer cars. Feedback is consistently positive, praising tighter body control, improved front end bite and a more composed rear on fast sweepers, all while retaining a refined ride for daily use.

Perfect for BMW F20 and F21 owners who want

• BMW 1 Series sway bar upgrade and stabiliser bar kit
• M135i and M140i handling upgrade for rear wheel drive models
• Front and rear roll bar set to increase roll stiffness
• Performance suspension upgrade for better cornering grip and stability
• ARB kit for fast road and track-day use

Professional fitting

Want it installed properly with a geometry setup to suit your driving style? Book fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Upgrade your BMW’s chassis with a proven stabiliser set from H&R and enjoy confident, flat cornering and a more responsive driving experience every time you turn the wheel.