Why have the cut out in frame if your not going to fill it with wheel? Srs q
Look have tested it and found a gap to be more aero.
I forget the exact deets/tech terms, but broadly speaking as the air attached to the tyre is pulled into the gap, if it's too tight then it stalls as it's squeezed out.
@Scilly.Suffolk started
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Why have the cut out in frame if your not going to fill it with wheel? Srs q