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The Mazda Center Cap Argument — 56 mm Caps, a 64 mm Claim, and a 67.1 mm Bore
Search Mazda center cap sizes and you will find a genuine argument. Three different numbers circulate for the same cars, they can't all be the cap, and the loudest listing isn't the right one. We publish conflicts openly on this site instead of quietly picking a winner, so here's the whole dispute, sourced, with our ruling and the reasoning behind it.
The claim: 64 mm
An aftermarket marketplace page advertises 64 mm caps for the Mazda 3, 6 and CX-5. It's a confident, specific claim — and we don't publish it as the fitment, because it collides with the part-number evidence below and sits suspiciously close to a completely different measurement on the same cars.
The evidence: ~56 mm caps, 57 mm clip ID, one part number
The OEM-documented cap for the Mazda 3/5/6, CX-7, CX-9, MX-5 and RX-8 (2009–2015) is part BBM2-37-190, with a clip ID of 2.25 in — 57 mm; the cap family itself is commonly listed at roughly 56 mm. A part number with published clip dimensions beats a marketplace headline, every time. This is the family we publish.
The third number: 67.1 mm, which is not a cap at all
Mazda 3/6/CX-5 wheels center on a 67.1 mm hub bore (5×114.3). That figure is real, documented, and completely unrelated to the cap — it describes how the wheel centers on the hub. Our read of the dispute: the 64 mm aftermarket claim appears to be a confused echo of bore-side numbers, the classic cap-versus-bore mix-up that causes more wrong orders than every other mistake combined. Once you've seen the pattern — a claimed "cap size" hovering near the car's bore spec — you'll spot it in other brands' listings too.
What to do with an argument like this
Don't take our side on faith; take the measurement. If your cap carries BBM2-37-190 or a sibling number, you're in the documented family. Caliper the clip tips and look for 57 mm. And if you ever find a sourced, part-number-backed document that contradicts what we've published, that's not a threat to this site — it's an update waiting to happen. Accuracy is the brand; being corrected by better evidence is the job.
Disclosure: this site stocks nothing and sells nothing directly — we earn on referrals, not on parts. Where we mention dealers or marketplaces, any shopping link that becomes an active affiliate link may pay us a small commission at no extra cost to you. That model is exactly why our advice starts with a caliper instead of a checkout button.
Related guides
- Tesla Center Cap Sizes — Three Published Answers, One Caliper
- Center Bore vs Center Cap Diameter — the #1 fitment mistake
- By Brand — the Mazda entry
Next steps
Run your numbers through the Cap Finder, or re-check them with the How to Measure walkthrough before you order.
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Sources: accio.com Mazda cap guide and eBay wheelfctry OEM listing for the ~56 mm family and BBM2-37-190's 2.25 in (57 mm) clip ID across 2009–2015 Mazda 3/5/6, CX-7, CX-9, MX-5 and RX-8; AliExpress aftermarket page for the 64 mm claim; opplehouse guide for the 67.1 mm bore. Conflict published openly — verify by measuring.