AT KO problem

RichP

NAXJA Forum User

Location

Effort, Pa

• Mar 27, 2004

• #1

Was just pulling the new warn front bumper off the safari rack and noticed that the drivers side rear tire looks like the bead about 1/2" back from the tire rim, that area that the KO's are supposed to protect, is seperating. It has a long crack about 5 inches long. Is this an issue, seems me to be.

 

8Mud

NAXJA Forum User

Location

Central Germany

• Mar 27, 2004

• #2

Don´t know what KO´s are but I´ve seen cracks that follow the curve of the sidewall about 1/2 back from the rim before. We call them heat cracks, usually caused by low air pressure, heavy loads and/or high speeds. Rubber gets hot and hard. I´ve used a dull knife blade to check how deep they are, usually only through the coating to the first corded ply. Never had a tire fail there, often ran my tires at triple digets for extended periods, hot enough to boil urine at a tire check stop. If you ever see a bulge, things are past curious to serious.

 

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Gray XJ

NAXJA Forum User

Location

Ca.

• Mar 27, 2004

• #3

Oh yea its an issue put your spare on and take the tire back to where you got it, check the otheres as well .Those tires have had issues like that in the past, where di dyou get them, hopefully Americas tire/Discoun t Tire they are preety good about replacing bad tires.

 

E

Erik the Red

NAXJA Forum User

Location

Northern california

• Mar 28, 2004

• #4

I just examined by KOs and I don't see any cracks, but I only have maybe 10-15000 miles on them and I haven't towed or carried anything heavy with them yet. I bought mine in November 02.

Erik
88 Comanche

 

RichP

NAXJA Forum User

Location

Effort, Pa

• Mar 28, 2004

• #5

Got busy yesterday and will run them back to BJ's where I got them in dec of 02, got full warranty on them.

 

E

Erik the Red

NAXJA Forum User

Location

Northern california

• Mar 28, 2004

• #6

Rich,

You have done any towing or applying heavy loads to the tires? I'm curious what might be causing the KOs to split I've been maintaining approximately 32 lbs of air pressure in mine.

Erik
88 Comanche

 

P

Planetcat

NAXJA Forum User

Location

NorCal

• Mar 31, 2004

• #7

I have 31's and tow a 3200 lb boat. No cracks and bead sits on rim perfectly all around. Especially since you have the warranty, bring it back and get a new one.

 

RichP

NAXJA Forum User

Location

Effort, Pa

• Mar 31, 2004

• #8

I have not done anything special or towed or carried heavy loads. Have not even aired them down. It is also only on that one tire....

 

L

L92XJ

NAXJA Forum User

Location

Orlando, Florida

• Mar 31, 2004

• #9

You might check other heat sources like dragging brakes or bearings.

 

G

gr8tires

NAXJA Forum User

Location

charlotte, nc

• Mar 31, 2004

• #10

Be sure you have proper air pressure in tires before getting to tire store!! As said above, bead cracks(if not deeper than 2/32") could be diagnosed as: Bead flow crack: this happens when the 2 types of rubber pull (bead rubber and sidewall rubber) away from each other in the lower sidewall.
AND: If the sidewall is deflected severely(going thru a pothole), and the rim flange cuts the tire above the bead area.
ALSO:::
If the last 4 digits of the other 3 tire's serial numbers(starts with letters: DOT) are all the same, have them check both sidewalls for cracking in ALL tires. :eyes:
Good luck!!!