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Re: Jet 90 Rear vs. Disk [jackmott]
In Reply To:
mike, those speed calculations, they assume that it is a rear wheel with the associated loss in advantage being at the back of the bike and shielded by the seat tube?

Nope. Those are for "naked" wheels with the "best" yaw data I could find at the time (which was over a year ago.) You should de-rate any time savings by...oh, say...50% for a rear wheel.

My sim has many flaws. I never intended to publish any results. I just built it to guide my race wheel purchase decisions last season -- which is why it's all tuned to a 21.5 MPH baseline. (I ended up with a Jet 60 C2 front and Jet Disk rear.)

What is really startling is how small the differences are among the various aero wheels (with a disk being the big standout). The non-disk differences are, IMO, so small that they are lost in the noise of external factors and simulation limitations.

EDIT: The sim is really a line integral around an ideal flat circular course at constant power and under constant wind velocity vector. I was curious what kind of yaw angles I would really experience at different wind speeds, given my baseline speed and power. (Yes, in any crowd other than ST, my engineering geekiness would be subject to much ridicule.) ;)


"100% of the people who confuse correlation and causation end up dying."
Last edited by: MOP_Mike: Sep 7, 09 19:30

Edit Log:

  • Post edited by MOP_Mike (Dawson Saddle) on Sep 7, 09 19:25
  • Post edited by MOP_Mike (Dawson Saddle) on Sep 7, 09 19:26
  • Post edited by MOP_Mike (Dawson Saddle) on Sep 7, 09 19:27
  • Post edited by MOP_Mike (Dawson Saddle) on Sep 7, 09 19:30