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Mercedes-Benz Center Cap Size — the 74 mm OE Cap
Mercedes-Benz is one of the simpler stories in European fitment: the brand's OE center cap is a 74 mm cap. One size, published by the OE-cap references, covering the mainstream Mercedes wheel range. Simple — but "simple" has burned plenty of buyers who stopped reading there, so let's be precise about what that number is and what it isn't.
What 74 mm means
The 74 mm figure is the cap's outer diameter — the measurement across the face of the cap. It's the number you match when you shop. As with every cap on this site, the fitment itself is decided by the clip diameter on the back of the cap and the opening in your wheel, so treat 74 mm as the family identifier: it tells you which shelf to look on, and your caliper tells you whether a specific cap belongs on your wheel.
What 74 mm is not: the 66.6 mm bore
Mercedes C- and E-Class wheels center on a 66.6 mm hub bore (5×112). That is a wheel-to-hub spec, not a cap size, and it's more than 7 mm away from the cap. The two numbers get swapped in listings and forum posts constantly. If a seller is quoting 66.6 mm as a "center cap size" for a Mercedes, they're reading the wrong column of the fitment chart — walk away and measure your own cap instead.
Why you still measure
A single published OE size doesn't mean every Mercedes wheel ever cast takes it. Special editions, AMG wheels, older designs and aftermarket replacements all live outside the mainstream family, and Mercedes has been making wheels for a very long time. The brand-level number gets you to the right neighborhood in seconds; the measurement gets you to the right house. Pop the cap, caliper the face, caliper the clip tips, read the molded part number if there is one. Two minutes, zero returns.
Materials and the salt question
Factory caps across the industry are mostly ABS plastic, with aluminum alloy, stainless and chrome-plated metal in the mix. If your Mercedes runs winter wheels in the salt belt — and in Canada, it does — favour quality ABS or coated metal. Cheap chrome plating and brittle no-name plastic are the first casualties of road salt, and a cap that survives the winter is cheaper than two caps that don't.
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.
Video: “DIY Mercedes-Benz Wheel Center Cap Replacement | Easy Step-by-Step Guide” — OMNITECH on YouTube →
Related guides
- BMW & Mini Center Cap Sizes — 57 mm or 68 mm
- Center Bore vs Center Cap Diameter — the #1 fitment mistake
- By Brand — the Mercedes-Benz 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: DEZENT magazine OE-cap fitment article (dezent-wheels.com) for the 74 mm Mercedes-Benz OE cap; hub bore via the opplehouse bolt-pattern / center-bore guide; materials and salt-belt notes via carinterior.alibaba.com hub cap guide. Sizes published as commonly listed — verify by measuring.