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smoother airflow over the crank.
That's dependent on crank type and how good a job you do.
I have less material facing the air with a full aero Fibrelyte ring compared to that setup. But without testing both, who knows which is more aero. @xavierdisley probably but he sees the world in smoke trails...
Just stumbled upon this in the HHSB thread:
Any thoughts on filling the spider vs. a Fibre-Lyte Total Aero chainring?