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PostPosted: Sat Dec 23, 2006 6:15 pm 
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Location: mid michigan
I've been looking for L.R.R tires for my metro but I've had a hard time even finding 12" tires. The only L.R.R. tires I've seen were like 15" or something. But get this, I was looking closer at my rear tires and they are low rolling resistance :o . They say L.R.R. right on the side wall. Sweet! My front ones aren't though. I'd like to find more of these, the brand is "Nankang" made in taiwan, 155R12s "Gelux". They leave a small foot print compared to my front tires. I will research them to try finding more. Anyone else have tires like these?

I also found out that the tires on my car are 3% bigger than stock, so I'll have to recalculate my mpgs. They will be even better 8) .

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94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Tue Jan 02, 2007 1:25 am 
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Location: Lummi Island
[ I also found out that the tires on my car are 3% bigger than stock, so I'll have to recalculate my mpgs. They will be even better 8) .[/quote]

I recently put 185/13s on the front of my metro and the highway mileage
went up a bit. It lowered the RPM's by about 200 at 70mph.
This is an estimate, I don't have a tach. I have never had over 40mpg.
but I drive fairly hard, maybe a new o2 sensor would help.....

MM


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PostPosted: Tue Jan 02, 2007 3:30 pm 
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Location: mid michigan
Now I'm not sure if 155r12s are 3% bigger than 145-80-12s. I read in a post (I forgot which one) on this site that they are the same height. I use this link to calculate the difference, http://www.miata.net/garage/tirecalc.html
but you need to know the aspect ratio, and my 155r12s don't show one. I just assumed they were 80 series tires. Is this a good assumption?

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Tue Jan 02, 2007 11:37 pm 
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Location: greenfield aka greentucky, Indiana
The 155r12's are the EXACT same height as the 145/80/12 tires as i have verified this with my gps in the car and the speedo is DEAD on till my cars lack of gearing to get past 92 mph.

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PostPosted: Wed Jan 03, 2007 8:39 am 
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Location: mid michigan
darn :? I was hoping they were 3% bigger, But thanks for the verification.

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Sun Feb 11, 2007 11:28 am 
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Location: San Antonio, Texas
I thought the 155R12's were actually an 82 series tire.

Or maybe it was the 145R12's?

According to Yokohama, it was the 155R12 and a few others:
http://www.yokohamatire.com/utrimwidth.asp

More aspect ratio links:
http://www.discussautomobiles.com/forum ... /t-51.html

This one has lots of info about aspect ratios about half way down the page: 145 10, 145 12 and 155 12 info - http://clubs.hemmings.com/clubsites/che ... ersion.htm

Tire cross reference charts on here with aspect ratios :
http://www.turbinecar.com/tires.htm

,

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PostPosted: Sun Feb 11, 2007 7:06 pm 
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Location: mid michigan
I verified my odometer using google earth, and it was within 1/10th of a mile for the 23 mile route I used. Thats with the 155r12s, so they seem to pretty much work out to be stock diameter in my case.

Good links metrofreak. According to the third link 155r12 should be 22.01" (as 82 series) vs. 21.1" for 145/80/12s. I don't know why my odometer is so accurate with that 4.1% difference? My odo may have been off stock and the 155r12s put it closer to accurate?

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Mon Feb 19, 2007 8:09 pm 
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Joined: Fri Oct 24, 2003 12:23 am
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Location: Oregon
Check this out. At tires-easy.com, they have 2 manufacturers for 145/70 R12's

Jintong
Summer tires JC1400
145/70 R12 69T With tires-easy.com only $ 17.40

Federal
All season tires SS-729
145/70 R12 69S With tires-easy.com only $ 20.80

Both are very inexpensive! Which do you think would have the lower rolling resistance?

Image


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PostPosted: Tue Feb 20, 2007 7:44 am 
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That tire size is going to lose you 3 mpg, rack up more miles on your odometer, and increase wear and tear on your engine. Low rolling resistance is more subtle than that. Any tire is low rolling resistance if you put enough air in it. 8) Read "Fear and Loathing in Las Vegas" if you want to learn about tire pressure.

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PostPosted: Mon Feb 26, 2007 7:49 pm 
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some of the fords have 12" tires, the older ones, the festiva i think, saw the other day at work.


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PostPosted: Fri May 09, 2008 10:28 pm 
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Location: Saskatoon, SK
In reply to Woody's comment: if a tire is inflated to higher than its rated pressure, it will quickly wear out the middle of the tread as it will bulge out and bear all the car's weight. A low rolling resistance tire is designed to have keep even pressure across the tread at a higher pressure.

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PostPosted: Fri May 09, 2008 10:51 pm 
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Location: Abbotsford, BC
joal_o wrote:
In reply to Woody's comment: if a tire is inflated to higher than its rated pressure, it will quickly wear out the middle of the tread as it will bulge out and bear all the car's weight. A low rolling resistance tire is designed to have keep even pressure across the tread at a higher pressure.


this is not completely true according to those who over-inflate their metro tires,
viewtopic.php?f=34&t=35891

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PostPosted: Tue May 13, 2008 9:23 pm 
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The only thing in that thread that supports your point of view is one guy who says he's had wonderful results for "nearly 10,000 miles". There is no question that high tire pressures will wear the center of the tread prematurely. If you just give is some rational thought, it's common f'ing sense. Going from the recommended 32 to 35 is no big deal, but up near 40 psi, you're going to start getting weird treadwear and reduced traction. LRR tires are designed for this and won't give you a treadwear problem, but remember this: THERE IS NO FREE LUNCH Tires with long treadlife warranties or high fuel mileage claims are not going to provide good traction. Hard tires roll easily and last forever, but do not grip well. Soft tires grip very well but don't last long. Take your choice, you can't have both. I choose to be able to stop the car in the rain.

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PostPosted: Tue May 13, 2008 11:01 pm 
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Hello. I'm new to this board.

I just purchased a 92 metro 2dr. automatic. and it came with a set of these Nankang Gelux 155R12 LRR. Are you saying this tire size is robbing the car of 3mpg? My other car is a Trailblazer SS with a 6.0 Ls2 so I know nothing about the mpg game.

Thanks!


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PostPosted: Wed May 14, 2008 5:48 am 
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No, Colby was looking at 145/70-12 tires. The 70 part indicates that they are shorter, that's what would reduce mileage. A tire that doesn't have any aspect ratio specified can be assumed to be 80 or 82.

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