2016-2019 BMW 7 Series Front Left Steering Knuckle 6879171

Also known as

Steering Knuckle

Spindle

Wheel Hub Carrier

Suspension Upright

Swivel Bearing

Front Left Axle Carrier

What this part does

The steering knuckle serves as the critical junction point between the suspension, steering mechanism, and the front wheel assembly. Situated at the outboard end of the front suspension, it houses the wheel hub and bearing while providing mounting points for the upper and lower control arms, tie rod ends, and the brake caliper. By acting as the pivot mechanism, it translates steering inputs from the rack and pinion into wheel movement. If this component bends or sustains micro-fractures from a hard impact, such as a deep pothole or curb strike, it becomes impossible to align the vehicle correctly. Symptoms of a compromised knuckle include severe uneven tire wear, a steering wheel that pulls to one side, and accelerated wear on surrounding suspension joints.

Fits these vehicles

OEM and interchange numbers

6879171

31216879171

31-21-6-879-171

31 21 6 879 171

Before you order

This specific front left steering knuckle is designed strictly for xDrive (all-wheel drive) models and will not mount correctly on a rear-wheel-drive chassis due to the required passage for the front CV axle shaft. Always match the 6879171 casting number or the full OEM part number with the unit originally installed on your vehicle to ensure proper control arm geometry.

While the knuckle itself does not require electronic coding, transferring your existing wheel speed sensor requires care to avoid damaging the delicate plastic housing. It is highly recommended to press in a new wheel bearing and hub assembly while the knuckle is off the vehicle, as separating the old components often compromises the internal bearing seals. Carefully inspect your lower ball joints and tie rod ends for excessive play before beginning the installation.