I can tell I'm getting better at this.

Last few weeks I noticed when I accelerated when I was at above 20mph, my rear wheel made swooshing noise.

Yea, this is what I have now. Mavic Aksium (source: Mavic)

I thought the hub was not tight enough, so the rim had play a bit. Nope. I checked and checked again, the play was less than 1mm side to side.

So I asked on the bike forum I go to, and they said, it's the noise the wheel set can make slicing through the air at high speed.

Ooooooooooooooohhhhhhhhhhhhhh! Really!!!!!!!

I never though I could ride fast enough to make that noise. This never happened last year, and it's still early in the season, I can easily accelerate at above 20mph.

This is awesome.