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The Mazda3 has lug nuts with thread size m12 X1.50, a 19 mm hex size, and a total length of 0.552''. Keeping your tires well-maintained is crucial for safe driving and preventing accidents. Eventually, you may encounter issues with these components, leading to premature tire wear, feathering, or cupping. It's important to regularly check tire pressure, inspect for punctures, and monitor the tightness of the lug nuts. As part of routine maintenance, consider replacing your tires every 30,000 to 50,000 miles to ensure road safety and avoid potential accidents.
Sorry Daniel, but I recently checked the wheel nuts on my Mazda 3 G20 Pure from July 2020. Here are the measurements: 20.9mm across flats, 25.07mm overall length, with a 60-degree taper and a 12mm x 1.5mm pitch.
The lug nuts on a Mazda3 are sized at M12 x 1.50 threads, feature a 19 mm hex size, and have a total length of 0.552 inches.
Both options are accurate. It is likely that Mazda made this change beyond just the North American market for the 2019-2020 model years, going from a 21mm head to a 19mm head and then back to a 21mm head. I previously worked at a dealership in the Gulf Coast area and we encountered some issues with the different head sizes. We may have had to replace some lug nuts because either Mazda provided the wrong wrench or the wheel cone did not securely hold them in place. I recall it being more of a nuisance than anything else. My 2019 Mazda3 BP Hatchback was originally equipped with 19mm lug nuts, although 21mm is the typical size used for most Mazdas in North America throughout the recent generations.