A hub for a human powered vehicle includes a rotation axis, a hub body
formed generally symmetrically about the rotation axis, the hub body
having a radially-outward-facing surface that includes a plurality of
surface features for improving the aerodynamic efficiency of the hub as
it passes through a fluid, and a wheel assembly attachment member formed
along a circumference of the hub body, the wheel assembly attachment
member being structured for attachment to one of a plurality of spokes
and the center of a disc wheel. The surface features may include a series
of depressions or a series of projections, and such features may have a
dimple shape that can be formed in a variety of shapes including those
with a cylindrical wall and a planar bottom or a hemispherical bottom.
Alternately, such surface features may have a hemispherical shape.