Parts for your 2021 Mazda 3-Strut mounts

2021 Mazda 3 strut mounts — what they do and when to replace them

Technical references confirm that the 2021 Mazda 3 (BP series) uses MacPherson strut front suspension, which relies on dedicated strut mounts. Sources include the Mazda Workshop Manual (BP) – Front Suspension, Mazda Australia MY21 Specifications, and professional data sets such as Autodata/HaynesPro, all list a MacPherson strut front and a torsion-beam rear (no rear strut mounts). Aftermarket catalogues also supply specific front strut-top mounts and bearings for the 2021 Mazda 3, reinforcing that this part is fitted from factory.

On the 2021 Mazda 3, the front strut mount sits at the top of each front strut assembly under the strut tower. It does three big jobs: it isolates vibration and harshness from the cabin via a rubber insulator, it provides a secure upper attachment for the strut, and—because the Mazda 3’s front suspension steers via the strut—it houses a bearing so the assembly can rotate smoothly as the steering turns. When it’s healthy, steering feels light and predictable, road noise stays civil, and tyre wear stays even.

There’s no fixed replacement interval for strut mounts, but they do age. Many owners see long life (80,000–150,000 km), while rough roads, heavy loads, or big potholes can shorten that. Good practice during scheduled servicing is to inspect the mounts whenever the front end is checked—especially if the car shows any steering quirks or tyre wear. Most technicians recommend replacing the mounts whenever new front struts or springs go in, as a pair, to keep steering feel and ride consistent left-to-right.

Tell-tale signs a 2021 Mazda 3 may need front strut mounts:

• Clunks, thuds, or knocking over sharp bumps or speed humps
• Creaking or groaning when turning the wheel at low speed
• “Notchy” steering, poor return-to-centre, or memory steer
• Uneven or accelerated front tyre wear and drifting alignment

Replacement involves compressing the spring and swapping the mount and bearing—work best handled by a qualified tech with the right tools. It’s smart to fit quality OEM or equivalent mounts, renew the bearing, dust boot and bump stop while in there, torque everything to spec, and finish with a proper wheel alignment. Given the Mazda 3’s torsion-beam rear, there are no rear strut mounts to worry about—attention is focused on the front pair for quiet, tidy steering and a comfy ride.

Popular questions about 2021 Mazda 3 strut mounts

Do all 2021 Mazda 3 models have front strut mounts?
Yes. All BP-series 2021 Mazda 3 variants use a MacPherson strut front end, so front strut mounts (with integrated bearings) are fitted. The rear is a torsion-beam design, so there are no rear strut mounts.

How long do the strut mounts typically last?
Many last 80,000–150,000 km, but life varies with road conditions and driving style. If front struts are being replaced due to wear or leaks, it’s wise to replace the mounts at the same time to avoid future noise or steering issues.

What noises point to a failing strut mount?
Common signs include clunks over bumps, creaks when turning at parking speeds, and a notchy feel through the wheel. If paired with uneven front tyre wear or wandering alignment, a mount and bearing inspection is due.