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Old 11-18-2009, 12:49 AM   #91 (permalink)
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This winter tire rolling resistance winner in many tests were Nokian hakkapeliitta R (New version) and the next best was Michelin XI2. Results were the same on overall test results. So i Would recommend hakkapeliitta R for new winter tires or if that is not sold then XI2.

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Old 11-22-2009, 01:12 PM   #92 (permalink)
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I noticed the Dunlop Fast Response Tyres posted quite well

I'm running Dunlop Sport SP1 and I love them, quiet, good grip and good eceonomy
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Old 11-22-2009, 02:24 PM   #93 (permalink)
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Quote:
Originally Posted by CapriRacer View Post
Ernie,

I have no idea why you were told this, but it is not true.

The reason tire manufacturers do not give out RR data is:

1) There is no agreed upon test procedure. There are at least 4 methods that I know of and they give different numerical values - although the rank order remains the same.

This is one of the issues troubling the California Energy Commission (CEC) when they try to come up with a regulation. The test results from different sources has to be the same.

2) Different test facilities given different results. This has been looked at and it is apparent that the test facilities can be correlated - however, the "base" facility (the one everyone else has to correlate to) has to be identified and a correlation procedure developed.

It has been suggested by NHTSA (National Highway and Traffic Safety Administration) that the Federal government (NHTSA) be the regulating body rather than have 50 different regulations - and their suggestion is to use a common tire for the correlation, so every tire tested would be a percentage of that - and their preference is the SRTT (Standard Reference Test Tire) Unfortunately, this doesn't address the tire size issue.

3) RR varies by tire size. Very early in the process, the CEC was confronted with the paradox that identical tires gave different results depending on tire size - with large tires giving smaller coefficients.

This might result in "one-off" tires that are used to characterize the entire tire line. However, if it were regulated that EVERY tire size / design combination were to be tested, it would occupy EVERY test facility in the world for over a year. In other words, no new development could take place.

So, NO, the tire manufacturers DO NOT know the RR of every tire they make.

The RMA (Rubber Manufacturers Association) has not only been cooperating with both NHTSA and the CEC to come up with a workable regulation, but they've also encouraging the regulators to understand the issues involved and overcome them. The tire manufacturers - through the RMA wants something that makes sense, is usable, and consumer friendly, and not too expensive. Thus far, it has been difficult to find concensus among the various stakeholders.

Nevertheless, it is just plain wrong to characterize the RMA as "gagging" the tire manufacturers. They ARE the tire manufacturers!! and they are trying to find a way to make it work.
I was struck by a couple of thoughts:
1. there really are two sides to every opinion

2. Ecomodder has attracted a pretty knowledged and varied group of posters
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Old 11-22-2009, 03:08 PM   #94 (permalink)
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...use the California RR-value numbers! California passed a law that all new cars sold in their state must use low-RR tires, so they must have a "scoring" of "listing" of what brands and model tires are acceptable.

...of course, you'd better send along a self-addressed and stamped envelope to guarantee any possibility of getting an "...answer..." since I'm sure their 'Postal $tamps Budget' ain't what it used to be (ha,ha).
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Old 11-23-2009, 06:55 AM   #95 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
...... California passed a law that all new cars sold in their state must use low-RR tires, so they must have a "scoring" of "listing" of what brands and model tires are acceptable.

......
I think you'll find the law did not make it through the process. It got caught up in exactly the problems I listed above.
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Old 11-30-2009, 04:09 AM   #96 (permalink)
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Useful information... thank you for keeping it alive!
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Old 04-14-2010, 02:24 PM   #97 (permalink)
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so... after all this time has there ever been a re-visit to "low rolling resistance tires"? Tax refund coming, and I planning on getting new tires... 13s
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Old 04-14-2010, 02:46 PM   #98 (permalink)
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When Round and Black Becomes Lean and Green
Also, Kumho has a new eco model coming.
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Old 04-14-2010, 02:58 PM   #99 (permalink)
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Quote:
Originally Posted by PaleMelanesian View Post
When Round and Black Becomes Lean and Green
Also, Kumho has a new eco model coming.
ya, seen that article... when I have a car with 15" (or larger) wheels I might be able to use those models of tires, any details on the Kumhos?

edit... I do see the Goodyear Integrity on thar, was hoping for a little better selection/detail on other 13" tires
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Old 04-14-2010, 03:03 PM   #100 (permalink)
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Kumho eco Solus perhaps?
Kumho eco Solus HM KR22

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