Toroidial Rim Shape Vs. New Hourglass Rim Shape For Deep Rims?

http://velonews.com/photo/97426
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This should be good.

Other than that, I bring nothing to the table.

“Between 2003 and Present, the designers learned that not only could this bulge be used to allow for various tire widths, but could be used to shift the *aerodynamic sweet spot *of the wheel. Most deep section or composite spoke wheels show minimum drag at around 20 degrees of wind angle. However, more than 60% of real world wind conditions occur between 10 and 20 degrees of wind angle. By moving the aerodynamic width of the rim towards the spokes slightly, and increasing rim curvature, the engineers were able to shift the maximum performance zone of the wheels into the wind angles which riders will see most often.”

http://www.zipp.com/_media/pdfs/technology/rimshape.pdf

Have had CFD done on that, it wasn’t a winning format.

I don’t think the owner or an employee of the FFWD company has done the same though :wink:

Stocking a bunch of Taiwanese rims in a warehouse, then spoking them through, putting red/black stickers on and selling them to customers who don’t know what CFD is for 900 euro a pop seems to work fine. So why bother with CFD or transatlantic trips to wind tunnels then…

So? What is CFD?

Computational fluid dynamics.

Basically, simulating a wind tunnel in a computer (far more interesting than a PC in a windtunnel)