Fitbit Air band specs are now public. Google’s screenless tracker is no longer limited to the bands sold in its own store.
Google has published a custom-band design guide and official 2D CAD drawings. They cover the Fitbit Air sensor pebble and sleeve. These are technical drawings, not ready-to-print STL models. Still, they give makers and accessory brands the dimensions and tolerances needed to design around the device.
Google is opening the band system
The Fitbit Air is Google’s tiny screenless wellness tracker. The tracker pops out of the band, so the strap affects more than style. It also affects comfort, sensor contact, retention, and whether someone wears the device overnight.
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- Image: Google.
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- Image: Google.
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- Image: Google.
Google tells designers to keep the optical heart-rate and SpO2 sensors unobstructed. The sensors also need flush skin contact. Google recommends at least 35 mmHg, or 0.68 psi, of pressure for better PPG performance during movement.
The snap-in holder has another job. It must keep the tracker locked during rigorous movement, while still letting users remove it when they swap bands.
This is maker-friendly, but not a free-for-all
The material guidance matters too. Google warns designers to use skin-friendly textiles, leathers, metals, coatings, and adhesives. It also lists restrictions for nickel, natural latex proteins, PFAS in textiles and leather, PVC, phthalates, and other materials.
Sellers should use phrases like “compatible with Google Fitbit Air.” They should not make Google or Fitbit Air part of the product name. Brands that want the Made for Google badge can apply through Google’s partner program.
This is a smart move for a small sensor pebble. Fitbit tried fashion-forward accessories before, including the PH5 knitted Versa wristband. Fitbit Air makes that accessory lane easier to explore, as long as makers remember one thing. A cute band still has to keep the sensors working.
