Glossary

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Flanges: the outer edge of a wheel hub to which the spokes are attached.
Flat spot: as applied to tires or bicycle wheels, refers to a condition in a tire or wheel is not precisely round. With a tire, it may be mounted improperly, the incorrect size, or be of poor quality or damaged. Flat spots in bicycle wheels can be caused by hitting an obstruction, or from maladjustment of spokes.
Foldable tire: A clincher tire with non-metallic (Kevlar, plastic or fiberglass) beads. This type of clincher tire can be folded for storage. Aka. Folding tire.
Freehub: A wheel hub with a built-in freewheel.
Freewheel: The ratchet mechanism that allows the rear wheel to turn without turning the crank. Necessary to allow coasting. It can be part of the hub or part of the freewheel cluster, depending on the design.