Parts for your 2021 Mazda 3-Struts

2021 Mazda 3 Struts: What They Do and When to Service Them

Technical sources confirm the 2021 Mazda 3 (BP-series) is fitted with MacPherson struts on the front axle. The Mazda BP-series workshop manual details a front MacPherson strut assembly with a coil spring and gas damper, while Mazda Australia’s 2021 model specifications list “MacPherson strut (front), torsion beam (rear).” Major fitment catalogues from KYB and Monroe also list front strut assemblies for 2019–2023 Mazda 3 (BP). That means struts are relevant to this model at the front, the rear uses a torsion beam with separate shock absorbers, not rear struts.

On the 2021 Mazda 3, the front struts pull more than one duty. They support vehicle weight, control wheel movement, and help keep the tyre’s contact patch stable under braking, cornering and over rough roads. Because the strut is a structural part of the suspension and steering geometry, it influences camber and helps the car track straight, brake confidently and ride comfortably.

As kilometres rack up, the internal valving and seals can wear. Fresh struts keep the hatch or sedan feeling planted, help protect tyres from irregular wear and maintain the crisp steering feel Mazda is known for. While there isn’t a strict replacement interval, many owners find performance tails off somewhere between 80,000 and 120,000 km—earlier if the car regularly tackles potholes or corrugated roads.

Good servicing practice is to inspect the front struts at routine services. A technician will look for oil seepage, damaged dust boots, perished bump stops, and play or noise in the strut mounts/bearings. Because the rear is a torsion beam with separate shocks, attention there focuses on the shock absorbers rather than struts.

• Common signs the front struts are tired include: longer stopping distances, extra bounce after speed humps, front-end “nose dive,” clunks over bumps, steering shimmy, and uneven tyre wear on the fronts.
• When replacing, it’s smart to do both fronts as a pair, fit new top mounts/bearings, and book a wheel alignment straight after. Correct torque with the vehicle at ride height helps prevent bush wind-up and future knocks.
• DIY is possible with the right spring compressor, but many owners leave it to a workshop for safety and to ensure alignment and any single-use fasteners are handled to spec.

Quality OE-equivalent parts (KYB, Monroe, or Mazda Genuine) keep the ride and handling consistent with factory feel, which suits Aussie and Kiwi roads nicely and keeps WoF/roadworthy inspectors happy.

Are there rear struts on a 2021 Mazda 3?

No. The BP-series Mazda 3 uses a torsion beam rear end with separate shock absorbers. Only the front uses MacPherson struts. Rear servicing focuses on shocks, bushes and alignment checks for thrust angle.

How long do the front struts typically last?

Many last 80,000–120,000 km, but lifespan depends on road quality and load. If the front gets bouncy, noisy, or starts wearing tyres oddly, it’s time for testing and likely replacement.

Is a wheel alignment needed after front strut replacement?

Yes. Because the strut is part of the steering geometry, replacing it can nudge camber and toe. An alignment restores straight-line stability, even tyre wear and proper steering feel.