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^decent track forks tend to have a large clearance for aerodynamics, to reduce boundary layer shear

Tight clearances were never about aerodynamics, because aerodynamics were barely considered in the days when tight was right. It was about shortening the frame members (fork blades and chainstays) to the minimum to achieve maximal stiffness within the unthinking constraint of invariant tube guages. There was also an erroneous belief that extreme shortening of the wheelbase yielded more appropriate handling characteristics for track racing.