Parts for your 2011 Subaru Legacy-Wheel hubs

2011 Subaru Legacy wheel hubs: what they are, why they matter, and how to look after them

Wheel hubs are absolutely fitted to the 2011 Subaru Legacy. Subaru’s factory service manual for the 2010–2012 Legacy/Outback platform details removal and installation of bolt-on “hub unit bearing” assemblies at the front and rear. The Subaru FAST electronic parts catalogue lists these hub assemblies for each corner, and major bearing manufacturers’ catalogues (e.g., Timken, NSK, SKF) match unitised hub-and-bearing replacements for this model. Put simply, the 2011 Legacy rides on hub units that locate the wheel, carry vehicle loads and house the sealed bearing and ABS encoder.

On this model, the wheel hub is a compact, sealed assembly that bolts to the steering knuckle (front) or rear backing plate. It supports the vehicle’s weight, keeps the wheel running true, and allows smooth rotation thanks to an integrated bearing. Wheel studs are pressed into the hub so the wheel can be clamped properly, and an ABS encoder ring within the hub feeds wheel speed data to the stability and braking systems. Because the bearing is sealed-for-life, there’s no periodic greasing, when it wears, the whole hub unit is replaced.

For servicing a 2011 Subaru Legacy, good workshop practice goes a long way to keeping hubs happy. Tyres balanced and rotated on schedule reduce bearing load, and correct wheel nut torque prevents distortion of the hub flange. During routine inspections, a tech will check for roughness, play or rumbling while spinning the wheel off the ground, and note any ABS faults. There’s no fixed replacement interval in the factory literature, hubs are changed on condition.

• Common clues a hub is on the way out: a droning or growling that rises with road speed, fine vibration through the seat, uneven tyre wear, ABS or VDC lights from a failing encoder signal, and detectable play when the wheel is rocked at 12 and 6 o’clock.
• When replacement’s needed, a quality hub with the correct ABS encoder specification for the Legacy should be used. Fastener and axle nut torque values from the Subaru manual must be followed, and the hub face and knuckle should be clean and corrosion-free before assembly.
• After fitting, a road test and scan for ABS data confirms the encoder is reading correctly. It’s also sensible to recheck wheel nut torque after a few hundred kilometres.

For Aussie and Kiwi owners keeping a Legacy roadworthy for rego or WOF, sticking to balanced tyres, avoiding kerb strikes, and addressing any new wheel noise early will help hubs last the distance.

Popular questions about 2011 Subaru Legacy wheel hubs

How can a driver tell if a 2011 Legacy wheel hub is failing?

Most drivers notice a steady humming or growling that increases with speed and doesn’t change much when the engine is revved. The tone can shift slightly when cornering as the vehicle loads one side. In some cases the ABS/VDC light pops up because the hub’s built-in encoder isn’t providing a clean signal.

On a hoist, a technician may feel roughness when spinning the wheel by hand, or find play when the tyre is rocked at the top and bottom. Uneven tyre wear and a faint vibration through the cabin can also point to a tired hub unit.

Do both hubs need replacing at the same time?

Not necessarily. Hubs are replaced on condition, so if only the left-front is noisy, only that corner typically gets changed. That said, vehicles driven in the same conditions can see the opposite side follow within months, so some owners choose to do pairs to minimise downtime.

Whether one or both are done, using quality parts and correct torque on the axle nut and mounting bolts is more important than doing them as a set.

Is a wheel alignment needed after hub replacement?

The hub itself doesn’t set alignment angles, but the knuckle and strut do. If those aren’t disturbed, alignment may remain within spec. However, rust cleanup, bolt slackening or previous wear can nudge tolerances.

Most workshops will at least check alignment after hub work, especially if there was vibration or uneven tyre wear beforehand. It’s a small step that helps protect the new hub and tyres.