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Old 17th March 2009, 12:49   #1
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Default Symptoms of tyre puncture in tubeless tyres

Hi All,

Am having a strange problem as to the ways to detect whether your tyre is punctured incase of a tubeless tyre.Now that may sound silly but let me explain.

For the last 4-5 days,am guessing the left rear tyre is punctured although not visible.The reason is when I try to turn left,the steering doesnt want to turn and needs a bit more of a force.

On Sunday,I had checked/filled all the tyres at 33psi.The very next day,I again checked and the left rear had come down to 20.I again filled it up to 33 but the tyre shop insisted there was no puncture(from glance though).

Can you please help me out?Also,how would you normally know a tyre puncture in tubeless unless its abs flat?
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Old 17th March 2009, 23:16   #2
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I don't think this is posted in the correct section. Anyway, since your tyre is losing, 13 PSI per day, and no puncture is visible, you wheel-rim might be bent or (if not alloy) corroded at the seams.

However, the only way to be sure is to dismount the tyre and immerse it into water.
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Old 17th March 2009, 23:49   #3
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Symptom of puncture: tyre goes flat!

... And it can do so slowly, possibly because what ever made the hole is still in the hole.

But yes, it can also be a damaged rim, or just that there is a problem with the seal.

As it happens, I too have such a problem, had for ages, and have just remembered to mention it this time on taking the car for service. Mine is on a front wheel, and, even before I can see that it has gone down. the steering will become heavy.
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Old 18th March 2009, 11:09   #4
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Thanks a lot Vipul and Thad. My car is anyway going for a service and will tell them to check it
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Old 18th March 2009, 12:07   #5
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What I have observed is that if you need to go for air refilling daily - then its surely a puncture.
With tubeless, you refilling frequency is more like once a month.

I have never had totally flat tyre with a tubeless. Its always been a slow deflation.
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Old 18th March 2009, 12:33   #6
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Yes. One can have a nail in a tyre and have only a slow puncture. Then maybe, one day, the nail gets moved, or driven out of the hole and fffffffffffph! the puncture is not slow any more!

I know that tyre pressures should be checked once a week, but very, very bad at doing so. Because we do a very low mileage in a diesel car we only need to buy fuel about once a month or so, and then we go for air also. Normally we find that three tyres just need a little, and one tyre needs a lot.

I'm also aware that it is very bad for a tyre to drive with very low pressure, and that fuel consumption gets worse too.

I know all things, and I should practice them.

What can I say? I am like this only? <Blush>
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Old 18th March 2009, 23:23   #7
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I had the same issue with one of my rear tyres. I had rusted rims.
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Old 19th March 2009, 10:43   #8
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Most likely it is a puncture. I had this in two different cars with tubeless tires. The pressure will go down to 20-22 psi within a few days of filling/checking the air. The first time it happened, I drove for like a month - every week checking/filling air before realising that this was not good. I called up my tire fellow and he confirmed it was a puncture.

What happens is that there is a slow leakage of air and the shape of the tire deforms somewhat around the nail effectively sealing it and then the pressure stays at 20-22 psi. It is very unlikely for any tubeless tire to immediately deflate on getting pierced by a nail or similar object. Possibly it will go flat overnight or if by chance (it is unlikely since the tire's lower pressure enables itself to 'clamp' around the nail) the nail gets pushed out.

There is no need to even take the tire off the rim. Most tire shops have the plug/solution to fix it cold and they do it in like 10 minutes with a pair of pliers. It is a bit of a messy job though.

I now will never ever buy a car without tubeless tires. No more tire changing ever...
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Old 19th March 2009, 10:58   #9
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what qualifies as a puncture?

my rear left wheel keep loosing 4 to 6 psi in 2 weeks time.
am running tubeless on stock steel rims.
the remaining 3 wheels stay at 30 psi over 2 week but one comes to 26 / 25 psi.

no puncture found and rim too seems fine. meaning no rust of dents. i had the tire removed and check the rim.

What else could be the problem?

UM
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Old 19th March 2009, 11:05   #10
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Quote:
Originally Posted by joy_swift View Post
.............Can you please help me out?Also,how would you normally know a tyre puncture in tubeless unless its abs flat?
Quote:
Originally Posted by sandeep108 View Post
Most likely it is a puncture. I had this in two different cars with tubeless tires. The pressure will go down to 20-22 psi within a few days of filling/checking the air............
What happens is that there is a slow leakage of air and the shape of the tire deforms somewhat around the nail effectively sealing it...
Yes quite likely a puncture - I had the same problem when one tyre would lose pressure by about 10 PSI every two days. I thought initially that it might be something to do with that tyre alone having lost its nozzle cap but the pressure loss was too high to be explained by that. I got it checked and it was a puncture.
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Old 19th March 2009, 11:27   #11
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Thanks a lot everyone for helpin me out with the puncture thing

Am still driving with the puncture but hope to fix it this Sat(if it doesnt get flat earlier)
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Old 19th March 2009, 11:50   #12
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Another possibility is a leaking valve. I sugest pump up to say 35psi and then immerse in water. The culprit is sure to show up.
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Old 19th March 2009, 12:28   #13
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Quote:
Originally Posted by sandeep108 View Post
Most likely it is a puncture. I had this in two different cars with tubeless tires.
-----------
Possibly it will go flat overnight or if by chance (it is unlikely since the tire's lower pressure enables itself to 'clamp' around the nail) the nail gets pushed out.
Right now I have the same problem with my one of rear tyres. It is leaking air very slowly, i.e. the tyre pressure goes down to 20 from 32 PSI over a period of 10 days. I am sure its a puncture because the rim is in a good shape. So, I am in a dilemma whether I should go on filling the air every 10 days or should I just get the puncture fixed. Any suggestions?
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Old 19th March 2009, 14:30   #14
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Get the tyre checked. Its a puncture that is not visible otherwise. Happens all the time
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Old 19th March 2009, 14:37   #15
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Quote:
Originally Posted by nagvasireddy View Post
Right now I have the same problem with my one of rear tyres. It is leaking air very slowly, i.e. the tyre pressure goes down to 20 from 32 PSI over a period of 10 days. I am sure its a puncture because the rim is in a good shape. So, I am in a dilemma whether I should go on filling the air every 10 days or should I just get the puncture fixed. Any suggestions?
I have the same problem with two of my B350s on the Accent. They seem to be losing about 1psi per day. Finally tracked the problem down to a very slow leak from the rim (I have alloys!). I have just learnt to live with it, and inflate the tyre(s) every week.
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