The "Filler" sub-category in freestyle MTB components includes Nipples and Spokes. A nipple is a small metal component used for fastening and adjusting the tension of wire or plastic tires, while spokes are thin metal rods that pass through the tire's hole and hold it onto the rim.

When selecting these components, it is important to consider the correct size and type to achieve the right balance between strength and weight, ensuring reliable tire attachment to the rim.

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