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Old 04-05-2009, 06:41 PM   #22 (permalink)
Ernie Rogers
Ernie Rogers
 
Join Date: Feb 2008
Location: Pleasant Grove, Utah
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The Rubber Manufacturers are hiding data

Quote:
Originally Posted by bwilson4web View Post
I have had no luck finding rolling resistance values at Tire Rack and as for other sources, it has been a mixed bag. It is as if rolling resistance is being hidden.
You hit it on the nose, Bob,

I was told by several tire company engineers that the tire makers are forbidden to give out rolling resistance data--the gag order was issued by the Rubber Manufacturers Association. The reasons given weren't convincing so I can't say why.

The car makers do have the data, however. A sure-fire method to find good tires is to check what the car factories are putting on their fuel-efficient cars.

My idea is that we can force publication of rolling resistance data IF we the buyers push the issue. Returning tires that give bad mileage is one way to do that.

I would say that a Cd of 0.01 or greater is totally unacceptable.

Ernie Rogers
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