Parts for your 2010 Subaru Impreza-Wheel hubs

2010 Subaru Impreza wheel hubs — what they do and when to replace them

Wheel hubs are absolutely fitted to the 2010 Subaru Impreza and are relevant to servicing. Technical references such as the Subaru Factory Service Manual for MY2008–2011 Impreza (Front Axle and Rear Axle sections) specify bolt-in “hub unit bearings” at each corner, and the Subaru parts catalog lists complete hub assemblies with integrated wheel studs and ABS tone components. On most 2010 Impreza and WRX models the hub uses a 5x100 PCD, the 2010 WRX STI uses a different hub with 5x114.3 PCD.

On this model, the wheel hub unit does a few big jobs: it carries the wheel studs, supports the vehicle’s weight via an integrated bearing, keeps everything rolling smoothly, and provides the trigger for ABS/traction control. Because the bearing is sealed into the hub, there’s no old-school repacking with grease — when it wears out, the whole hub assembly gets swapped.

Owners will usually first notice a worn hub by a low, steady rumble that rises with road speed, a droning on smooth bitumen, or a faint vibration through the seat or floor. Other clues include ABS or VDC warning lights (if the tone ring or sensor signal goes off), uneven tyre wear, or free play when the wheel is rocked at 12 and 6 o’clock.

There’s no set replacement interval — hubs often last well past 100,000 km — but they should be checked at every service. A quick on-hoist spin-and-listen test and a wheel-play check are simple and effective. Keeping wheel nuts torqued correctly (typically around 120 N·m on this model) helps hub longevity, as does avoiding kerb hits and pothole punishment.

When replacement time comes, it’s a straight bolt-in job on the 2010 Impreza: remove the caliper and rotor, unplug and carefully extract the ABS sensor, then undo the hub bolts (and axle nut on the front). The axle nut is single-use, replace it and torque to the Subaru spec (often in the ~220–240 N·m range for the front — check the exact spec for the variant). A light smear of anti-seize on the hub-to-knuckle face can make the next service easier, but keep it well away from studs and friction faces. After fitting, road test for noise, confirm no ABS/VDC lights, and recheck wheel-nut torque. An alignment generally isn’t required for hub replacement, but it’s smart to inspect tyres and suspension while you’re there.

• Most 2010 Impreza/WRX: 5x100 hub pattern, 2010 STI: 5x114.3 hub pattern.
• Sealed unit-bearing hubs — replace as an assembly, don’t attempt to repack.
• Use new axle nuts/bolts where Subaru specifies single-use fasteners.

What’s the wheel stud pattern on a 2010 Subaru Impreza?

Most 2010 Impreza and WRX variants use a 5x100 bolt pattern. The 2010 WRX STI uses 5x114.3 with a different hub and bearing assembly. Always check the VIN and build plate if you’re unsure, especially when mixing sedan/hatch or performance trims.

Can the bearing in a 2010 Impreza hub be serviced or repacked?

No. It’s a sealed hub unit bearing. If it’s noisy, rough, or has play, replace the complete hub assembly. This design improves sealing and durability but removes the need for periodic bearing repacks.

Is it safe to keep driving with a humming wheel hub?

Best not. A noisy hub can worsen quickly, affect braking stability and ABS performance, and chew out tyres. Organise a check and replacement sooner rather than later to keep it safe and roadworthy.