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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...
hippy
Filling the spider! DIY, and smoother airflow over the crank.
You can then buy a 'normal' ring, that you'd be able to sell to a wider audience when the time came to get rid.