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Aerodynamic aids...molded on tires

Yokohama Tires added more 'spoilers' on tire sidewalls. The tiremaker molded angled fins on the side walls to help reduce drag while the tires are spinning. The upper part of the tire side reduces aerodynamic drag while the lower side fins help reduce lift.

How about using this research and ecomod test it on your 'smooth' wheel covers?

News Release | Yokohama Rubber Advancing Tire Aerodynamics Technology

Well, RTV in a tube is just the stuff for this!

Quote:

Originally Posted by botsapper (Post 496607)

The tire would have to be tuned for every application.(every different car it was installed on).They're free to make any claim they like,but it's a dis-service not to emphasize the context of their claim.

Looks to be an interesting article on this main topic.

Surface Finishes - why are they not used on an F1 car
Dimpled Surface Finish
http://www.formula1-dictionary.net/I...cycle_tire.jpg

Quote:

Zipp Speed Weaponary, one of the world’s market leaders in racing bicycle wheels hold the world patent on dimpled disc cycle wheels, and they seem to work, being chosen by a number of top teams including some Tour de France front runners. Zipp use a roughly meniscus-shaped dimple with a flat bottom that sweeps upwards near the edges. Apparently this shape is popular in current golf ball design, particularly with manufacturer Titleist.

The above article actual has very little to do with tires, but has value.

2009-10-09
Dunlop's 4th Generation Runflat Tires
http://www.ityre.com/en/main/news/item/16845/
http://www.ityre.com/i/dimpled_sidewalls.jpg

Quote:

The dimples carved on surface of the sidewall provide better heat radiation through turbulent airflow, which shows the effect of reduction of approximately 10%, compared with tires without dimples.

That quote above was taken from the chart in the link above.

The below is a little off-topic, but may be of interest.

2012
Nike's Dimpled Tracksuits Could Help Athletes Shatter World Records At This Summer's Olympics
http://gizmodo.com/5909327/nikes-dim...mmers-olympics
http://i.kinja-img.com/gawker-media/...8ulazv0jpg.jpg

Quote:

Originally Posted by kach22i (Post 496958)

Looks to be an interesting article on this main topic.

Surface Finishes - why are they not used on an F1 car
Dimpled Surface Finish
http://www.formula1-dictionary.net/I...cycle_tire.jpg

The above article actual has very little to do with tires, but has value.

2009-10-09
Dunlop's 4th Generation Runflat Tires
News Dunlop's 4th Generation Runflat Tires - www.iTyre.com
http://www.ityre.com/i/dimpled_sidewalls.jpg

That quote above was taken from the chart in the link above.

The below is a little off-topic, but may be of interest.

2012
Nike's Dimpled Tracksuits Could Help Athletes Shatter World Records At This Summer's Olympics
Nike's Dimpled Tracksuits Could Help Athletes Shatter World Records At This Summer's Olympics
http://i.kinja-img.com/gawker-media/...8ulazv0jpg.jpg

Here we go falling into the MythBusters trap.
Reynolds number of tiny bicycle tires,at bicycle velocities don't dovetail very well to larger structures at highway velocities.
Same for runners suit.

Speed holes!

What is it in the nature of a dimple that makes it better than an equivalent bump? Surface area?

Quote:

Originally Posted by aerohead

At least the two designs are symmetrical so they don't have to deal with handedness.

Quote:

Originally Posted by freebeard (Post 497113)

Speed holes!

What is it in the nature of a dimple that makes it better than an equivalent bump? Surface area?

At least the two designs are symmetrical so they don't have to deal with handedness.

A dimple is lighter.Uses less material.It can't be abraded and worn off.And it doesn't increase frontal area.