Start with the original specification
Subaru recommends original-equipment tires and, when changing brands, the same size and style as originally equipped. For a 2020 WRX, verify the actual trim’s tire specification rather than borrowing a size from an STI or another year.
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Measure the remaining set
Record all four tire models, sizes and tread depths. Ask the installer to check the vehicle’s matching requirements before recommending a single replacement. The manufacturer FAQ does not supply a universal acceptable tread-depth difference, so this guide does not invent one.
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Plan around the complete set
Tell the fitter about seasonal tires, aftermarket wheels or any previous replacements. Obtain a recommendation based on the actual set and manual. A tire that mounts on the wheel is not automatically an appropriate match for the vehicle’s other three tires.
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- Manufacturer technical reference ↗Reviewed Oct 6, 2026
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