Genuine BMW F20 F21 F22 Lower Chassis Brace / Underbody Cross Brace – OEM Front Subframe/Crossmember Reinforcement for 1 Series & 2 Series (M135i M140i M235i M240i 116i 118i 120i 118d 120d 125d) – Underfloor Bracing Upgrade

Factory Lower Chassis Brace for BMW F20 F21 F22

Transform the way your BMW 1 Series and 2 Series feels on the road with this genuine BMW lower chassis reinforcement bar. This original equipment underbody bracing stiffens the front end for sharper steering, improved turn-in and a more planted, confidence-inspiring drive under hard acceleration.

We have fitted this part in-house at MJ Modifications and the feedback has been outstanding. Customers consistently report that the floaty sensation is gone and the car feels tighter, more stable and more precise, whether on fast A-roads or daily commutes.

Why this chassis reinforcement is a must-have

• Reduces front-end flex for crisper steering response
• Helps the car track straight and feel more connected to the road
• Enhances traction and stability during hard acceleration
• Excellent value handling upgrade and a quick, simple bolt-on
• Designed by BMW for perfect fitment using existing mounting points

Fitment

Compatible with BMW F-series small chassis cars, including:

• BMW 1 Series F20 and F21, including M135i and M140i, plus popular variants such as 116i, 118i, 120i, 118d, 120d, 125d
• BMW 2 Series F22, including M235i and M240i

Many vehicles in this platform were not supplied with this brace from the factory, while some 3-door M135i models and a handful of F22 cars did receive it. Adding it to cars that missed out is one of the most effective, budget-friendly handling improvements you can make.

Installation and advice

This is a straightforward, direct-fit cross brace. No cutting or permanent modification required. For best results, install with fresh hardware and tighten to BMW torque specifications.

Prefer professional fitting? Book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote.

Search-friendly highlights

BMW lower chassis brace. Front subframe brace. Underbody cross brace. Front crossmember reinforcement. Underfloor bracing. Chassis stiffening bar for F20 F21 F22. Handling upgrade for M135i M140i M235i M240i. Bolt-on stability brace for BMW 1 Series and 2 Series.