Tyre out of round

Submitted: Saturday, Feb 17, 2007 at 17:58
ThreadID: 42418 Views:2266 Replies:6 FollowUps:0
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If this question has been answered before, my apologies. Direction to the answer appreciated.
I use my 80 Series Landcruiser almost exclusively on bitumen to get to limestone tracks to go on the beach. Tyres are fully inflated except on sand and are re-inflated immediately on return to tracks.
Otherwise it's parked in my driveway.
The last four times I have bought tyres it was because one has gone out of round well before tread required replacement. One shot tyre means buying two.
Various brands used but not top end, expensive ones as advice from tyre people suggests no real advantage, given my use.
Originally used to deflate for tracks, but advised exaggerated flexing on deflated tyres causes ply adhesive to "let go", causing air bubbles and "out of round" problem.
I therefore adopted the practice of only deflating for sand, but the problem has arisen again.
Any thoughts?
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Reply By: Steve - Saturday, Feb 17, 2007 at 20:48

Saturday, Feb 17, 2007 at 20:48
What you pay for is what you get ...buy bleep ...cop bleep ...its the same in tyres ...if you think a third rate tyre is going to do what a top quality unit will do in the same circumstances..you are kidding yourself .. 'let go ''...'out of round'...all nice talk ...but are you looking for blood out of a stone ??
AnswerID: 222348

Reply By: Eric Experience - Saturday, Feb 17, 2007 at 22:21

Saturday, Feb 17, 2007 at 22:21
Fly.
Sounds like an overload problem, Is the load rating / max pressure exceeded? Eric.
AnswerID: 222366

Reply By: Grandpa joe - Saturday, Feb 17, 2007 at 22:56

Saturday, Feb 17, 2007 at 22:56
Some tyres fail in this way when the tyre is rotated and the revolving direction has been changed. The tyres construction (casing, steel belt, canvass, etc) has been formed over in one direction over many kilometers then when the tyres rolling direction is reversed, these layers will partially seperate (especially the cheaper ones) And may produce an egged, out of round or complete tyre failure. (like when you see a complete tyre tread, minus the rest of the tyre on the side of the road)
AnswerID: 222373

Reply By: fly - Sunday, Feb 18, 2007 at 15:14

Sunday, Feb 18, 2007 at 15:14
Thanks to the two of you with a positive comment.
I am certain it isn't an overload or pressure issue as I'm careful in that regard. It tends to happen to a front tyre which maybe significant?
I doubt that rotation , as per Grandpa Joe's comment, is an issue but will investigate further.
I also thought suspension might be allowing too much rebound causing undue fatigue on tyres, but I've completely replaced springs and shocks and the problem arises again?
AnswerID: 222464

Reply By: Rod W - Monday, Feb 19, 2007 at 11:29

Monday, Feb 19, 2007 at 11:29
I've currently got a BFG Allterrain (as a spare) that has developed a bulge on the tread (gone out of round). This is the third one that has done this. When on the vehicle at low speed its like driving down a rough track but seems to level out at speed ie 60/70kph.
AnswerID: 222640

Reply By: fly - Monday, Feb 19, 2007 at 11:53

Monday, Feb 19, 2007 at 11:53
Rod,
According to Steve ( the first reply ) it's because yout BFG's are cheap. I suspect you might dispute that. Comments of the uninformed!!

Have you had any "informed" or "expert" opinions on why this is occurring?

Beware, I've had the same issue with apparently smoothing out at speed on the highway, but it eventually "let go" at 90kpm going up a hill ( nice place to change wheel ) and completely ruptured. Subsequently advised the heated air allows bubble to smooth out some but actually causes ply to further separate and eventually totally compromises the tyre integrity causing the full rupture and potential vehicle damage as well as likely accident from loss of control.

Now I change tyre immediatley but am frustrated that it should even happen.
AnswerID: 222642

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