Wheel carrier, Front axle. Porsche 991 / 981 Boxster / 981C Cayman

Front axle wheel carrier, also known as steering knuckle.
Designed for precision and durability, it’s the crucial component that connects your wheel hub, suspension, and steering systems—ensuring smooth steering response and reliable alignment.

Fits:
Porsche 981 Boxster 2012 - 2016
Porsche 981C Cayman 2013 - 2016
Porsche 991.1 Carrera 2012 - 2016
Porsche 991.2 Carrera 2017 - 2019 *Cars without rear axle steering (I470)

Diagram ref no 1

The wheel carrier bears the load of braking, suspension forces, and wheel torque. Any compromise here can affect safety, braking stability, and wheel alignment.

Symptoms of Failure:
•  Uneven or rapid tyre wear
•  Vehicle pulling to one side / poor alignment
•  Clunking or knocking noises over bumps
•  Vibrations in steering wheel
•  ABS / traction control warning lights
•  Braking instability or pulling under braking
•  Visible cracks, bends, or damage after impact

When to Replace:
•  After accidents / collisions – especially front-end or wheel area impacts
•  When alignment cannot be corrected despite multiple attempts
•  If cracks, bends, or corrosion are found during inspection
•  When suspension components don’t fit correctly (hub, bearings, ball joints, control arms)

If you experience steering pull, abnormal tyre wear, vibrations, or braking instability, it’s time to have the knuckle inspected.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99134115

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