Parts for your 2017 Subaru Legacy-Wheel hubs

2017 Subaru Legacy wheel hubs: purpose, care, and when to replace

Wheel hubs are absolutely fitted to the 2017 Subaru Legacy. Technical sources confirm this: the Subaru factory service manual for the 2015–2019 Legacy/Outback (BN/BS series) describes bolt-on hub unit bearings at the front and rear in the Front/Rear Axle sections, and the Subaru Genuine Parts Catalogue for BN-series Legacy lists complete hub assemblies (for example, front hub assembly group 28373F- series and rear hub assembly group 28473F- series, exact part numbers vary by VIN and market).

On this model, the hub is a sealed, unitised assembly that combines the wheel bearing, mounting flange and wheel studs, and the magnetic encoder for the ABS/traction control system. Its job is to let the wheel spin smoothly while keeping it located dead true on the knuckle, carrying vehicle loads through the bearing and providing the signal source for wheel speed sensors. Because it’s a sealed unit, there’s no greasing or adjustment during routine servicing—when it’s worn, it’s replaced.

As part of regular servicing, a tech will usually check for roughness or play by spinning the wheel and feeling for grinding, listening for a humming growl on a road test, and checking for any ABS faults. Impacts with potholes or kerbs, over-torqued wheel nuts, and water ingress (from damaged seals) are the usual life-shorteners for hubs on a Legacy.

• Common signs a hub needs attention:
  • Humming or droning that grows with speed and often changes when cornering
  • ABS or traction control light due to a failed encoder/sensor signal
  • Disc-to-pad knockback or slight steering shudder under light braking
  • Noticeable wheel play when rocked at 12 and 6 o’clock

Replacement is straightforward for a workshop: the Legacy uses a bolt-on hub unit. The brake caliper and disc come off, the axle is freed from the splines, and the hub bolts are removed from the knuckle. Corrosion can seize the hub to the knuckle, so expect extra time in high-salt environments. Always clean the mating surfaces, replace any single-use fasteners (including the axle nut where specified), and torque everything to the Subaru spec from the service manual. An alignment isn’t usually needed unless suspension bolts are disturbed.

For best results, choose quality OEM or reputable aftermarket hubs that include new wheel studs and an integrated ABS encoder ring. During tyre rotations or brake work, insist on correct wheel-nut torque with a torque wrench—over-tightening is a hub killer. If a hub is noisy, replace it promptly to protect braking performance and tyres.

FAQs

How long do wheel hubs last on a 2017 Subaru Legacy?
Many last well past 120,000–200,000 kilometres, but lifespan depends on road conditions, driving style, and wheel-nut torque practice. Because the bearing is sealed, there’s no preventive greasing—when wear or noise shows up, replacement is the fix.

Is it safe to drive with a noisy hub?
It’ll usually get you home, but it’s not recommended. A failing hub can worsen quickly, affect ABS/traction control readings, and compromise braking stability. Get it inspected and replaced sooner rather than later.

Do replacement hubs include the bearing and studs?
Yes. The 2017 Legacy uses a unitised hub assembly that comes preloaded with the bearing, flange, wheel studs, and the ABS encoder ring. That means faster, cleaner replacement and no bearing pressing on the car.