It can delay the stall angle and increase lift after stall.
Performance Variations of Leading-Edge Tubercles for Distinct Airfoil Profiles which in bike tubes could be easier handling and lower "drag" (cdx) with crosswinds
but it is also very dependent on the Reynolds number (size /speed of the airfoil) so the bump size and frequency has to be tuned for that.
@svenhöek started
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It can delay the stall angle and increase lift after stall.
Performance Variations of Leading-Edge Tubercles for Distinct Airfoil Profiles
which in bike tubes could be easier handling and lower "drag" (cdx) with crosswinds
but it is also very dependent on the Reynolds number (size /speed of the airfoil) so the bump size and frequency has to be tuned for that.