Is a Quick-Release Steering Boss Legal in the US?

Conditional

A quick-release steering boss lets the wheel detach, which means it cannot carry a driver airbag. On an airbag-equipped car that makes it a removal of required safety equipment; on a pre-airbag car it is more of a safety-and-security question than a legal ban.

Why?

A quick-release hub exists to pop the wheel off, so by design there is nowhere for a driver airbag to live. On any car that came with a driver airbag, fitting one deletes that airbag, and the federal make-inoperative rule prohibits a shop from disabling required safety equipment.

There is also a practical safety point: a poorly made or worn quick-release can introduce play or, in the worst case, let go, so the mechanism has to be a quality unit that locks solidly. That matters as much as the paperwork.

On a pre-airbag car a quick-release boss is generally allowed provided it is secure and safe. On a modern airbag car it means losing the airbag, which a business cannot legally remove for you and which reduces crash protection.

What decides if it's legal

A quick-release boss cannot house a driver airbag.
Fitting one to an airbag car removes federally required safety equipment.
The make-inoperative rule bars a business from disabling that airbag.
On a pre-airbag car it must still be secure and safe.

Does it depend on your state?

Yes. On a car with a driver airbag it removes required safety equipment and runs into the federal make-inoperative rule; on a pre-airbag car the concern is a safe, secure install rather than a legal prohibition.

Related legality guides

Find your car in the garage

Sources

This page is general guidance, not legal advice, on the rules in the US for quick-release steering boss. The detail varies by exact vehicle and changes over time - confirm with your insurer and the EPA, NHTSA and your state DMV before modifying.