• 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.

  • 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...

  • There is that (and F-L are too busy too make me a Total Aero ring for 7400).

    Off the top of my head I agree with you, that matching the arc of the spider arms is going to beat a flat infill.

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