Polyurethane bushings for BMW 3 Series E46 / Z4 / 5 Series E39 / front axle anti-roll bar mount with Ø 24 mm — TA Technix

The original bushing is made of rubber: it filters well, but deforms under load. When cornering or braking, the arm moves by a few millimeters and the geometry changes during the maneuver - this is the slop between the steering wheel and the wheels.

Polyurethane deforms much less: the connection becomes precise and repeatable, and the car responds at the same point every time. In return, more road noise and vibrations are transmitted into the cabin, especially when cold.