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Old 09-04-2017, 11:18 AM   #11 (permalink)
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https://www.thoughtco.com/silica-enh...pounds-3234486

According to this, the benefit is from hysterisis:

Quote:
Somehow, the use of silane allows both natural and synthetic rubber to bond together much tighter at a molecular level, and produces a rubber compound that has both low hysteresis at low frequencies and high hysteresis at high frequencies, allowing tire engineers to literally both have and eat their cake. The magic triangle has been blown to smithereens by the magic compound. According to a paper on this issue in the journal Rubber World: “The use of silica can result in a reduction in rolling resistance of 20% and can also improve wet skid performance by as much as 15%, substantially improving braking distances at the same time.
I don't have a lot invested in this, I'm just gathering information in anticipation of a new set of tires.

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Old 09-04-2017, 12:17 PM   #12 (permalink)
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Quote:
Originally Posted by freebeard View Post
https://www.thoughtco.com/silica-enh...pounds-3234486

According to this, the benefit is from hysterisis:



I don't have a lot invested in this, I'm just gathering information in anticipation of a new set of tires.
Allow me to give everyone a short cut:

Pretty much EVERY tire uses silica nowadays. It's old technology. The question is, how can you tell what the RR level is compared to the tire's grip and treadwear?

Unfortunately, you can't. Grip and treadwear are delineated by the UTQG rating - required for all P type tires (except for winter tires!), but RR is more complex and doesn't lend itself to simple testing/labeling. It varies by tire size - even for tires built exactly the same. HOWEVER, RR varies more between make/models than it does for size, further complicating the issue.

This means that trying to gain an improved RR by changing tire size yields small changes, where changing make/model yield larger changes.

A proposal to change the UTQG rating system to include RR has stalled. I don't know what the current proposal is (it was announced, but not published!), but a previous proposal ran afoul of the problem is tire size and how to label.
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Old 09-04-2017, 04:01 PM   #13 (permalink)
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I have Nokian Entryes on my cobalt and an happy with them. They claim LLR, they are quiet and ride/handle fine I didn't see any change in MPG with them but I'm not consistent on my driving. Previous tires I spin a lot when wet, I don't spin nearly as much with these. Still undecided between them and WRG3 for Penny's Rogue. Price difference is large.
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Old 12-02-2019, 04:44 PM   #14 (permalink)
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It looks like no one's discussed winter tires here in 2 years. Has anything changed?

I have steep hills, lots of snow and ice. R2 or G3 for the Camry? Both have equal LRR properties? Any new options, or are nokian still the best LRR Winter tires? Any other tires on the attached cr winter tire list, LRR & worth considering?
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Old 12-02-2019, 04:54 PM   #15 (permalink)
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I have Nokian WRG3/4 on 5 of 6 of my cars, I set personal best tanks with my XFE and a 2010 Cobalt this summer with them on before I sold it.

Just to try something different I put 2 Toyo Celcius on the XFE, cost slightly more than WRG's but have a mileage rating of 60,000 where some of the WR's have no mileage warranty. Not sure if it's affected MPG. The little data I can find they score about the same as G3's in snow/ice traction.
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Old 12-02-2019, 06:53 PM   #16 (permalink)
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I just put Cooper Evolution tires on the '04 Forester and Goodyear Viva 3 on the front of the '07 Accord just in time for the ice storm.
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Old 12-03-2019, 01:44 PM   #17 (permalink)
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Nokian Hakka R3s are excellent. They are "ultra" low rolling resistance; while the eNtyre are just low rolling resistance.
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Old 12-03-2019, 02:13 PM   #18 (permalink)
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Alright, where can I get the lowest price? Wanted to get them today, if I get a great deal. Did I miss the Black Friday specials?
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Old 12-03-2019, 02:40 PM   #19 (permalink)
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I've ordered lots from simpletire but sometimes simpletire and others sell them cheaper on ebay. Ordered a pair from walmart.com ended up coming from simpletire.
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Old 12-03-2019, 03:58 PM   #20 (permalink)
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P215/55R17

Looks like best price goes to Simpletire.com

$158.38 + tax free shipping R3

Wrg4 $121.47 + tax free shipping

Looks like today is the last day to get the Black Friday deal, ends wed 10am.


Last edited by Galvatron1; 12-03-2019 at 10:28 PM..
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