Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-07-2009, 07:55 AM   #1 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,691

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,268
Thanked 721 Times in 458 Posts
"Green" tires to be standard in Europe by 2012

This is based on another article from the eco-issue of Auto Motor i Sport (2/2009).

The European Union is reducing CO2 by setting limits for the automotive industry. In order to raise fuel efficiency (and lower CO2 emissions) the car companies will have to switch to "green" tires with lower rolling resistance. In fact, the EU has mandated that all new cars in Europe be sold with eco-tires in 2011, and all new aftermarket tires must have lower rr in 2012. To aid customers in choosing best tire, they (tires, not customers) will have tags that help compare their rolling resistance, grip and noise. The tags are similar to ones that can be found on all household appliances sold in Europe, stating their energy (and sometimes water) comsumption class. Unfortunately, which class the tire falls into will be solely up to the manufacturer. This shouldn't worry us with tires from well-known producers, such as Michelin whose been selling lrr tires since 1992, but could be a problem with cheap tires from China.


Attached Thumbnails
Click image for larger version

Name:	opony.jpg
Views:	176
Size:	41.6 KB
ID:	4969  
__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell


[Old] Piwoslaw's Peugeot 307sw modding thread
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-07-2009, 11:13 AM   #2 (permalink)
EcoModding Lurker
 
JonnyG's Avatar
 
Join Date: Nov 2009
Location: PA
Posts: 46

97RAV - '97 Toyota RAV4
90 day: 22.97 mpg (US)
Thanks: 0
Thanked 3 Times in 3 Posts
Is there going to be an exception in certain countries for winter tire use during certain months?
__________________
  Reply With Quote
Old 12-07-2009, 01:41 PM   #3 (permalink)
A madman
 
brucey's Avatar
 
Join Date: Mar 2008
Location: WV
Posts: 1,018

Pequod - '17 Subaru Outback
90 day: 22.79 mpg (US)
Thanks: 73
Thanked 183 Times in 98 Posts
Send a message via AIM to brucey
It's my understanding you can get low RR snow tires that perform excellent already. The Hakka R's come to mind.
  Reply With Quote
Old 12-07-2009, 01:45 PM   #4 (permalink)
EcoModding Lurker
 
JonnyG's Avatar
 
Join Date: Nov 2009
Location: PA
Posts: 46

97RAV - '97 Toyota RAV4
90 day: 22.97 mpg (US)
Thanks: 0
Thanked 3 Times in 3 Posts
Oh I didn't know that. I'll have to look into those for myself.
__________________
  Reply With Quote
Old 12-07-2009, 01:46 PM   #5 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,203

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)

Daox's Volt - '13 Chevrolet Volt
Thanks: 2,501
Thanked 2,585 Times in 1,553 Posts
Are they using standardized testing for the tires now? Last I hear, Crr testing was completely up to the mfg and they all do it differently.
__________________
Current project: A better alternator delete
  Reply With Quote
Old 12-07-2009, 07:32 PM   #6 (permalink)
Banned
 
Join Date: Feb 2008
Location: california
Posts: 1,329
Thanks: 24
Thanked 161 Times in 107 Posts
Is there going to be an exception for track or autoX tires?
  Reply With Quote
Old 12-08-2009, 01:03 AM   #7 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,691

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,268
Thanked 721 Times in 458 Posts
I think the testing is still up to the mfg, but there are some independent institutes that may check it (and EcoModders as well ). There will be more testing and checking as this starts to get more and more important.

I don't know anything about track or 4x4 tires.

I've noticed that most articles on low rr tires (including this one) comment that lower rr reduces grip and braking efficiency, but only once have I read that those are two different animals: Rolling resistance is mostly from the tire wall flexing, while grip depends mostly on the type of rubber used in the tread. Of course, tread pattern has an effect on both, and decreasing sidewall stiffness can improve grip while increasing rr. If a tire is reengineered to have a stiffer sidewall, good tread pattern and soft rubber tread (all in the right proportions), then it will have lower rr while retaining safety and handling parameters.

Or you can just pump your tires and drive slower
__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell


[Old] Piwoslaw's Peugeot 307sw modding thread
  Reply With Quote
Old 12-08-2009, 06:38 AM   #8 (permalink)
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 794
Thanks: 4
Thanked 388 Times in 237 Posts
Quote:
Originally Posted by Piwoslaw View Post
........I've noticed that most articles on low rr tires (including this one) comment that lower rr reduces grip and braking efficiency, but only once have I read that those are two different animals: Rolling resistance is mostly from the tire wall flexing, while grip depends mostly on the type of rubber used in the tread. Of course, tread pattern has an effect on both, and decreasing sidewall stiffness can improve grip while increasing rr. If a tire is reengineered to have a stiffer sidewall, good tread pattern and soft rubber tread (all in the right proportions), then it will have lower rr while retaining safety and handling parameters.

....
Sorry, but sidewall stiffness hardly enters the equation when it comes to RR.

RR is pretty much all about the tread compound - how much, what kind, how much deflection (basically inflation pressure). You just can't escape the Wear / Traction / RR triangle.

Barry's Tire Tech
  Reply With Quote
The Following User Says Thank You to CapriRacer For This Useful Post:
Piwoslaw (12-09-2009)
Old 12-08-2009, 09:06 AM   #9 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
...tire "hysteresis" is a function of rubber flexing upon contact with the road, then compressing under weight, then un-flexing upon release from the road.

...that's *why* an older, well worn tire has a lower rr value than does an identical brand new tire.

Last edited by gone-ot; 12-08-2009 at 02:24 PM..
  Reply With Quote
The Following User Says Thank You to gone-ot For This Useful Post:
Piwoslaw (12-09-2009)
Old 12-08-2009, 10:31 AM   #10 (permalink)
EcoModding Apprentice
 
Join Date: Aug 2008
Location: Lake Charles
Posts: 193

Black Beauty - '09 Honda Accord EX-L
90 day: 27.44 mpg (US)
Thanks: 12
Thanked 12 Times in 11 Posts
Green tire regulations will mean more advances for us as well.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hyperinflating tires CapriRacer Hypermiling / EcoDriver's Ed 276 03-14-2022 03:51 AM
Top 5 most fuel efficient tires (Lowest Rolling resistance: LRR) blackjackel General Efficiency Discussion 144 01-25-2016 11:39 PM
Discussion on tire efficiency Ernie Rogers General Efficiency Discussion 69 12-27-2014 01:17 PM
New Wheels & Tires trikkonceptz Success Stories 9 11-03-2008 02:05 PM
News: Under-inflated Tires Waste 5.3B Liters of Fuel/Year in Europe MetroMPG General Efficiency Discussion 3 03-06-2008 10:23 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com