well about 3 weeks ago i replaced my rear tires, going from S-02's to Yoka ES 100 245/45/16. had them installed and everything was Perfect...


fast forward 2 weeks and one of my Brand new rear tires get a nail in it. Since i bought the tire warranty they ordered me a brand new tire.

so yesterday i take my car down there because the tire finally came in, so now i have a Brand new tire with less than 10 miles on it, and the other one has about 500 +/- miles on it.


now the Air Pressure is perfect. I have checked this maybe 3 times, this was my first suspicion.

I know only getting one new tire is generally a NO-NO. but with both being so new i thought i would have no problems.....


so now what guys? the car feels Identical to what the car feels like when the air pressure is of side to side, when i take it up past 5k in any gear Besides the 1-2 shift, the back end feels really shaky


Pics.

Diverside Tire.


Pass Tire


Driverside Tire press.


pass. side tire press

 

You've got me stumped. Maybe they are from different lots/molds or different factories and thus are different sizes somehow? Maybe your replacement is just a defective tire, there certainly should be no problem with just 500 miles difference. Maybe the mold release compounds haven't worn off the new tire yet.... Just guessing here.
Can you define "Shaky?"
Do you mean it pulls one way when on the throttle hard and then pulls the other way when you get off the throttle in gear (engine braking)?

 

how would i be able to tell if the tire is defective? is there any way to argue that to the Tire place?


BTW i bought my tires at America's Tire Co. and still have warranty on both. How many miles do you think is acceptable in this case? 1000 between the two?

 

Yea what i mean by shaky is that when i accel, Shift gears and get back on the gas, while I am in the process of shifting the car feels like the rear end is steeping out to one side, and then back again.

same thing happens when i accel up to about 6-7k in any gear and let off the gas the rear feels like its stepping out, It is really hard to explain,

all i know is i feel Identical to what un-equal tire pressure feels like.

 

I would have them check the balance of the newly installed tire.

 

If it were the balance it would have a Vibration feeling at certain speeds and be intermittent. it wouldn't effect driveability so much that the car feels unsafe to drive,

my car feels horrible, It is NOT a pleasure to drive anymore...


thanks for the suggestion tho

 

The reason that unequal tire pressures in the rear cause the handling problems that they do is because one tire is effectively larger in diameter than the other. I'd say you are perfectly OK to around a 2000 mile difference R/L depending on how fast you wear tires.

Start with the obvious:
1.Both sidwall markings are the same: same brand, model, size, treadwear, etc.
2.the front wheels/tires are on the front and rear wheels/tires are on the rear. (believe me, stranger things have happened.)
3. dismount the wheels, measure the outside diameters of the tires with a tailors tape (or anything flexible, not strechable and long enough -Like a lampcord), are they exactly the same O.D.? (you never know)
4. Remount them, switched R/L. Do the handling problems persist the same, or is the car pulling opposite on accel/decel from what it was before? What else changes, if anything?

That's all I can think of right now, those seem like really low pressures you are running for such a soft sidewall tire, you might try 34-36 PSI and see if that changes anything.

Again, it could be release compound that hasn't run off the new tire yet.

Good luck
Mike

 

Yes i realize the tire pressure is a bit low, I will pump these bad boys up a bit and see if anything changes,


I have already swapped the rear wheels side to side. the same exact thing happens but the motion in which it does has changed. So it is a tire problem.

In the mean time, i Just got back from the tire place, I told them what was happening, told them it was Perfect when i drove in and Horrible when i left.

a new tire is on order and will be here in 3 days.

 

**update**

the brand new tire they install on my car was Defective, the tire installer told me when he removed it and rolled it on the ground the tire had some "attitude" to it.

so now they replaced it with another new one and the problem is fixed......

 

Glad you got it all sorted out, that is the second time I recall someone getting a brand new defective ES100.