Toe Arm Bearing Upgrade.

The MMX OEM Toe/Traction Arm Bearing is machined from billet 6061-T6 aluminium to replace the factory rubber bush found on BMW G8x and F8x M2, M3 and M4 models. Where the standard rubber bush allows movement under load, this pillow bush design eliminates that deflection entirely, giving the rear suspension a fixed, predictable pivot point through every phase of a corner.

That precision translates directly into consistent rear toe settings under dynamic driving. As load transfers through acceleration, braking and cornering, the arm holds its geometry rather than flexing, so the rear axle tracks true rather than drifting out of alignment when it matters most. The knock-on effect is more even tyre wear and more stable temperatures across the contact patch, since the tyre is no longer working against unwanted toe change mid-corner.

For the driver, this shows up as tangibly improved chassis dynamics: sharper feedback, quicker response to inputs, and a rear end that stays composed under hard driven road or track use. It is a focused, single-purpose upgrade rather than a full suspension overhaul, so it complements the rest of the OEM setup without altering the car's fundamental character.

Durability is addressed with a rubber-booted pillow bush, protecting the bearing from road grime and moisture while retaining the rigidity benefit over the standard part. Installation is a direct OEM-fit replacement requiring no modifications, making it equally suited to a daily-driven road car or a dedicated track build.

Full vehicle kits require 2x MMR55-1650 (this part) and 2x MMR55-1651 (camber arm bearing), or for vehicles with an MMX adjustable rear toe arm (MMR55-1609), 1x MMR55-1650 and 2x MMR55-1651.