Could a 5mm stone cause puncture?

K

ksher

Veteran
 Bedfordshire
I have just removed a 5mm small stone from rear tyre, and did a test by putting a droplet of water over the tiny hole. Water would not fill the hole, and bubbles were popping out. Does that mean the stone had went through the rubber. It was only 5mm big in diameter, and was on top of the rubber (not even in the tread.

Does anyone know how thick the rubber is? I'm going to check the tyre pressure in 3 hours time and see if it drops.
 
Its hard to say. A few months ago I did something similar, and was pretty shocked how big the stone actually was, but it didn't puncture the tyre.

Was it small, infrequent bubbles when you put the water over it? Maybe just a very slight puncture? :?
 
I did the test again after 2 hours, and no bubbles came out. I also checked the tyre pressure and it was only 0.05 bar lower (it was 3.0 bar about 4 weeks ago). So I assume the sharp stone did not penetrate the tyre.

I will check the pressure again tomorrow morning, or this weekend.
 
I'd imagine it depends on tyre thread and if the stone fully penetrated.

Assuming it's a new tyre with 8mm then you should be ok.
 
ksher said:
I did the test again after 2 hours, and no bubbles came out. I also checked the tyre pressure and it was only 0.5 bar lower (it was 3.0 bar about 4 weeks ago). So I assume the sharp stone did not penetrate the tyre.

I will check the pressure again tomorrow morning, or this weekend.
Click to expand...
Isn't 3.0 bar too high, that's about 44psi?

I'm sure the ///M only uses 2.1f/2.2r (31/32psi).
 
Never known a roadcar to be on 3.0 bar.

If you had bubbles on the first try, it is losing air so there will be a hole.
 
I think on my 19's the recommended pressures are: 2.3 / 2.8 bar (~ 34 / 41 psi)


mmm-five said:
Isn't 3.0 bar too high, that's about 44psi?

I'm sure the ///M only uses 2.1f/2.2r (31/32psi).
Click to expand...
 
The recommended tyre pressures on 18" wheels on E89 are 2.5 bar (front) and 3.0 bar (rear).

I adjusted the two rear tyres back to 3,0 bar, and had no problem this morning (relieved).
 
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