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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-11-2013, 10:58 PM   #1 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,709

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,161
Thanked 2,736 Times in 1,709 Posts
Bridgestone Announces Large Diameter Narrow Tires

This is pretty cool!

News | Corporate | Bridgestone Corporation


Large & Narrow Concept tire
(Tire size: 155/55R19)

__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following 3 Users Say Thank You to NeilBlanchard For This Useful Post:
aerohead (11-16-2013), mikeyjd (03-31-2014), Tulok (07-18-2016)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-11-2013, 11:21 PM   #2 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,168
Thanks: 1,723
Thanked 579 Times in 396 Posts
You'd need some special rims to run that, wouldn't you? Most 19" wheels I know are around 8-9" wide. That tire comes out to about 6" wide. That gives you some sidewall stretch. Don't know if it's too much or okay, but I would think you'd need to use rims 7" or narrower with these tires.

Love the idea, though.
  Reply With Quote
Old 03-11-2013, 11:49 PM   #3 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,593

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,533
Thanked 3,374 Times in 2,125 Posts
Kind of like back to the future... like classic VW tires, and most anything '40s and older...
__________________


  Reply With Quote
The Following 2 Users Say Thank You to Frank Lee For This Useful Post:
Ryland (03-15-2013), wdb (03-14-2013)
Old 03-12-2013, 12:14 AM   #4 (permalink)
EcoModding Newb
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 6,706

Acura TSX - '06 Acura TSX
90 day: 28.07 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 28.08 mpg (US)
Thanks: 2,194
Thanked 2,549 Times in 1,883 Posts
Interesting. The added benefit of the larger diameter and narrow width is 8% better traction in wet conditions. I wonder how the dry performance compares.

In science class they always teach that contact area doesn't influence grip or friction because the higher weight on the smaller contact patch equals out the equation. Why doesn't this work in practice? Race cars have enormous wheels.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 03-12-2013, 12:32 AM   #5 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,593

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,533
Thanked 3,374 Times in 2,125 Posts
They need more rubber to dissipate heat.
__________________


  Reply With Quote
Old 03-12-2013, 12:39 AM   #6 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Cedar Rapids, IA
Posts: 1,766

The Karen-Mobile - '05 Dodge Magnum SXT
Team Dodge
90 day: 26.72 mpg (US)

Fiat Dakota - '00 Dodge Dakota SLT RWD Quad Cab
90 day: 16.67 mpg (US)

The Red Sled - '01 Dodge Durango SLT 4WD
90 day: 16.96 mpg (US)
Thanks: 799
Thanked 681 Times in 437 Posts
Quote:
Originally Posted by redpoint5 View Post
In science class they always teach that contact area doesn't influence grip or friction because the higher weight on the smaller contact patch equals out the equation. Why doesn't this work in practice? Race cars have enormous wheels.
Science class does not take into account the property of materials used in the grip/friction model. Rubber has a finite static coefficient of friction, and the smaller the surface area of rubber presented to the asphalt, the more likely it will be that the motive force spinning the wheels will overcome the static friction presented between the rubber and the asphalt.

(With wheels that are rolling on a surface, there is always a patch of static friction contact between the wheel and the surface, even if the wheel is moving - that is said to be traction. Overcome that static friction, and the wheel starts to spin freely against the surface - or it loses its traction.)

I'd like to be able to find some wheels to fit these kind of tires.
__________________
The Fiat Dakota


The Karen-mobile


The Red Sled
  Reply With Quote
Old 03-12-2013, 12:49 AM   #7 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,168
Thanks: 1,723
Thanked 579 Times in 396 Posts
It's heat. No matter how big your tires, the contact patch for the same pressure is exactly the same size. Narrower tires, however, have a long patch, which causes more carcass deformation than a wide patch, which causes more heat build-up.

Something Bridgestone touched upon in the press release. I guess they're getting around it with stronger sidewalls and higher pressures, which makes for a smaller contact patch.

The wet weather grip is no surprise. Wider tires hydroplane more than regular ones, and narrow tires tend to hydroplane less.
  Reply With Quote
Old 03-12-2013, 01:27 AM   #8 (permalink)
.
 
Join Date: Dec 2011
Location: The Berkshires, Massachussetts
Posts: 884

Ruby Sparks - '01 Honda Insight
Team Honda
90 day: 64.27 mpg (US)
Thanks: 111
Thanked 360 Times in 201 Posts
If you had some light weight rims, they'd be perfect for lowering highway rpm and getting better mpg. Which is hard to do with any currently available tire because they'd have both a higher rolling resistance and weight.
__________________
I try to be helpful. I'm not an expert.
  Reply With Quote
Old 03-12-2013, 02:00 AM   #9 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,593

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,533
Thanked 3,374 Times in 2,125 Posts
Quote:
No matter how big your tires, the contact patch for the same pressure is exactly the same size.
That's a popular but incorrect notion.
__________________


  Reply With Quote
Old 03-12-2013, 02:57 AM   #10 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,168
Thanks: 1,723
Thanked 579 Times in 396 Posts
Close enough for government work, as long as the tires are of the same type, construction and height.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com