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I use my aero Wheels for road racing, tris, and TT. So wouldnt want to og too small.
My rims are 28mm at the widest point. But have a pretty poor rim-tub Interface With 25s. I reckon 22 would be the sweetspot. Maybe even smaller. Cant imagine it make much of a difference on the rear though, so I stick to 25mm there.
Depends who's pedalling them round.
I think tyre/rim aeros are just one of those things where there's too many variables, you just need to test.