I have 175/70/13 on my corolla right now, Michilen Radial X, from Costco.
I just found out the stock size is 155/80/13.
I guess finding tires in my oem size are harder.
So comparing the two here is what I found out.
I currently have 175/70/13 size "Radial X" on it right now came with the car.
Section Width: 7" on 5" rim
Rim Diameter: 13 in 330.2 mm
Overall Diameter: 22.68
Sidewall Height: 4.82 in 122.42 mm
Radius: 11.32 in 287.52 mm
Circumference: 71.12 in 1806.4 mm
Revs per Mile: 917
I just found out 155/80/13 is the OEM size for my 90 Corolla Coupe.
Section Width: 6.10 in 155 mm
Rim Diameter: 13 in 330.2 mm
Overall Diameter: 22.76 in 578.10 mm
Sidewall Height: 4.88 in 123.95 mm
Radius: 11.38 in 289.05 mm
Circumference: 71.50 in 1816.1 mm
Revs per Mile: 913.8
Of course with slight variances for different tire brands.
(Basically my 175/70/13 tire is .536% to fast & Diameter Difference is 0.53% to small)
That is about 5 more revolutions of the tires/wheels for 1 mile on the car currently. The width is 6.88"in compared to the stock 6.10"in width. I can save about .78" or 3/4" on my tire width. I guess getting the stock size tires will improve my MPG and resistance/drag a little bit so I will be putting the OEM recommended tires back on these wheels.
My problem now is finding a 155/80/13 tire for more MPG or energy saving tires.
I just went to tirerack and found only 2 (two) tires they sell for my size
Are my tires so small and out of date or is it the small size is a good benefit already that is does not have to be mentioned? Either way Here is the comparison of the 2 i found in my OEM size. I never through downgrading tire size would happen to me.
They are:
Kumho - Solus KR21
Section Width: 6.2"in
Overall Diameter: 22.8"in
Weight: 14lbs
Tread Width: Not Listed
Revs per Mile: 914
Made in China?? Humm
$200 per set
-or-
Firestone - Winterforce
Section Width: 6.2"in
Overall Diameter: 22.8"in
Tread Width: 4.6"in
Weight: 16lbs
Revs per Mile: 910
Made in Argentina?????? WHAT! lol
$196 per set
Weight savings and closest to OEM is the Kumho Solus KR21 for $200 a set.
Not bad and a total of 8 lbs lighter for a full set then the Firestone tires, I do not have a very good picture of them anyways. I guess Korea is getting my dollar but the tires are made in CHINA?!? I guess labor is still cheaper in China then in Korea and will probably stay that way forever due to the overpopulation of china and the vast size of its land. They are both comparable in all surveys but it seems the Firestones ranked better and supposedly get better dry traction?
From all the reviews of people on both tires it seems the Kumho's are getting 3 to 4 times the distance out of them and only cost $1 buck more each. I knew Firestones sucked
Plus I am not putting winter tread tires on my car, the sound would be horrible by looking at the tread pattern. Where else can I find tires in my size sheesh!
Anybody have any opinions I would love to hear them.