Aerodynamics

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Aerodynamics

Postby froze » August 1st, 2015, 10:30 am

I understand that Flo test their wheels in a windtunnel so I have a question concerning that.

Why is it that companies that make aero wheels always tell people to put the deepest dish wheel in the rear and a lesser dish wheel in the front while aerodynamics tests done have proven that the deeper dish wheel is more effective on the front then the rear due to the frame of the bike blocking a good percentage of the air hitting the wheel?

Wouldn't it make more sense to put a Flo 60 on the front and a Flo 30 on the rear for the person wanting to save money vs putting a 30 on the front and a 60 on the rear?

I understand the handling quirks of a deeper dish wheel on the front but that doesn't start having any real problems until you get up past a 60mm deep wheel like into the 90 range.

Assuming you have windtunnel access which you say you do, can you test your wheels with a 60 in the front and a 30 in the rear and see if there is any gain vs running the wheels in the usual way with a 30 in the front and a 60 on the rear? And give us the comparison results of both ways.
froze
 
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Re: Aerodynamics

Postby Chris Thornham » August 3rd, 2015, 8:34 pm

froze wrote:I understand that Flo test their wheels in a windtunnel so I have a question concerning that.

Why is it that companies that make aero wheels always tell people to put the deepest dish wheel in the rear and a lesser dish wheel in the front while aerodynamics tests done have proven that the deeper dish wheel is more effective on the front then the rear due to the frame of the bike blocking a good percentage of the air hitting the wheel?

Wouldn't it make more sense to put a Flo 60 on the front and a Flo 30 on the rear for the person wanting to save money vs putting a 30 on the front and a 60 on the rear?

I understand the handling quirks of a deeper dish wheel on the front but that doesn't start having any real problems until you get up past a 60mm deep wheel like into the 90 range.

The biggest reason is handling. When you have a deeper wheel on the front in relation to the back, your handling gets worse. A bikes stability increases when the front wheel is shallower than the rear wheel.

Assuming you have windtunnel access which you say you do, can you test your wheels with a 60 in the front and a 30 in the rear and see if there is any gain vs running the wheels in the usual way with a 30 in the front and a 60 on the rear? And give us the comparison results of both ways.

This is something that we can consider testing the next time we are in the wind tunnel if we have enough time.


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Chris Thornham
FLO Cycling: http://www.flocycling.com
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