09-04-2017, 11:18 AM
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#11 (permalink)
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Master EcoModder
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https://www.thoughtco.com/silica-enh...pounds-3234486
According to this, the benefit is from hysterisis:
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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.
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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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09-04-2017, 12:17 PM
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#12 (permalink)
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Tire Geek
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Quote:
Originally Posted by freebeard
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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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The Following 2 Users Say Thank You to CapriRacer For This Useful Post:
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12-02-2019, 04:44 PM
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#13 (permalink)
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Environmentalist
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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?
Last edited by Galvatron1; 12-03-2019 at 04:53 AM..
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12-02-2019, 06:53 PM
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#14 (permalink)
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Master EcoModder
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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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12-03-2019, 01:44 PM
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#15 (permalink)
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Master EcoModder
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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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The Following User Says Thank You to NeilBlanchard For This Useful Post:
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12-03-2019, 02:13 PM
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#16 (permalink)
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Environmentalist
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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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12-03-2019, 02:40 PM
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#17 (permalink)
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Master EcoModder
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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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The Following User Says Thank You to roosterk0031 For This Useful Post:
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12-03-2019, 03:58 PM
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#18 (permalink)
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Environmentalist
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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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12-03-2019, 10:30 PM
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#19 (permalink)
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Environmentalist
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I got the R3 today, looking forward to higher fuel efficiency!!
Consumer Reports says wet braking is poor, handling, hydoplaning, dry braking is not good. Can anyone share their R3 experience with these properties?
Last edited by Galvatron1; 12-03-2019 at 11:37 PM..
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01-12-2020, 10:43 AM
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#20 (permalink)
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Environmentalist
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Unfortunately, sears refunded, said they weren't able to get it in. Guess I'm stuck with OHTSU all seasons this winter. Fortunately, not much snow this year.
Quote:
Originally Posted by NeilBlanchard
Nokian Hakka R3s are excellent. They are "ultra" low rolling resistance; while the eNtyre are just low rolling resistance.
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How can you tell R3's are ultra low rolling resistance, while eNtyre are just low rolling resistance? I didn't see it listed as such on simpletire.com. Which all seasons are ultra low rolling resistance & which is ranked #1 as the absolute best in fuel efficiency?
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