Parts for your 2020 Subaru Impreza-Wheel hubs

2020 Subaru Impreza Wheel Hubs — Purpose, Use, and Service Advice

Wheel hubs are absolutely used on the 2020 Subaru Impreza. Technical references including the Subaru Factory Service Manual for the 2019–2020 Impreza (Chassis/Brake and Suspension sections), the Subaru Global Parts Catalogue, and major bearing manufacturers’ application data (e.g., Timken, SKF, NTN) all specify bolt-on, sealed hub and bearing units for both front and rear. On this model, the hub assembly integrates the wheel bearing, wheel studs and an ABS encoder ring, and bolts to the steering knuckle (front) or rear housing.

On a 2020 Impreza, the hub’s job is to let the wheel spin smoothly while supporting the vehicle’s weight and keeping alignment true. The studs on the hub hold the wheel, while the integrated bearing keeps friction low and noise down. The ABS encoder ring in the hub feeds precise wheel speed signals to the stability and ABS systems, helping the car keep its footing in dodgy conditions. Being a sealed unit, it’s designed for long service with minimal fuss.

Because these hubs are sealed, they’re not serviceable in the traditional sense—there’s no repacking with grease. Instead, the focus is on periodic checks and correct installation. During routine servicing, a technician should:

• Spin and rock each wheel for roughness or play, and listen for a humming or growling that changes with road speed.
• Inspect for ABS faults that may be caused by a damaged encoder ring or contamination at the wheel speed sensor.
• Check for corrosion at the hub-to-rotor face that could cause brake pulsation or wheel wobble.

When replacement is needed, the hub assembly is unbolted and swapped—no pressing required. On the front, the axle nut is removed and re-torqued to factory spec after fitting. Using the correct torque on the axle nut and wheel nuts is vital