Part of a wheel hub that holds the wheel to the dropouts.

This tag is for all types of Axles.

You could also use [thru-axle] if your wheel has a shaft that screws in like an oversized bolt. Also known as Through Axle.

Many axles are [quick-release] based and have a [skewer] through a hollow tubular axle to retain them.

Older bikes and some BSOs have simple wheel nuts that thread onto a solid bolt-like shaft.

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