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Thread: Losing tyre pressure?

  1. #1
    Regular Member paul_sri150's Avatar
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    Default Losing tyre pressure?

    Right this might sound like a silly question, but I am getting a little paranoid about a cracked wheel

    I am losing air from one of my wheels, however it is not alot, I will put 38 psi in and after about 2 months it will drop 8-10 psi, but it never seems to get any lower than that

    Could it just be a very fine puncture or a weak valve?

    Just hoping it's not a cracked alloy, to be honest though it's not that bad that I will be rushing to get it fixed, a little air in tyre now and again doesn't hurt lol

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    Regular Member Craig1985's Avatar
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    That is alot imo, you must have a puncture, weak Valve, perished sidewall, weak seal or cracked alloy. Take to a tyre fitters and chuck 40psi in and place in a water bath , the high psi should show the leak

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    Regular Member paul_sri150's Avatar
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    Hmmm suppose I'll have to go when I get round to it

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    Regular Member Grumpy1954's Avatar
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    One of mine does similar, will drop 5 - 8psi, then be fine for weeks, but then, wife and I both suspect tampering with our car tyres. Couldn't prove it last time as she had to pull off the dual carriageway and it killed the tyre beyond testing. Best to get it checked - I will, when I get around to it, just can't face driving with the spacesaver spare unless absolutely necessary......

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    Regular Member paul_sri150's Avatar
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    Quote Originally Posted by Grumpy1954 View Post
    One of mine does similar, will drop 5 - 8psi, then be fine for weeks, but then, wife and I both suspect tampering with our car tyres. Couldn't prove it last time as she had to pull off the dual carriageway and it killed the tyre beyond testing. Best to get it checked - I will, when I get around to it, just can't face driving with the spacesaver spare unless absolutely necessary......
    sounds similar to me, but i remember when i first bought the wheels from danboy i was setting the correct pressures in them and the valve in question was a little loose, so might need nipping up or re-fitting

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    Regular Member m111kan's Avatar
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    my guess would be the valve. as above, get the pressure up and stick it in water

    my drivers side tyres on the fez go completely flat in a matter of days if i pump them up. i know thats down to the tyres not having a good seal on the rim. putting 'snoop' around the rim shows the air escaping all the way round

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    Regular Member blues n twos's Avatar
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    This sounds familiar

    I had exactly the same on mine last winter and I finally took it in for repair and it turned out to be a cracked rim in two places. It will loose pressure down to a certain psi and then stop.

    It may not be but prepare for the worst.

    I had mine repaired without any further problems for £70. This was a 19" snowflake alloy which tend to be prone to cracks when hitting potholes

    Jon

    My original post re loosing pressure....
    http://www.vectra-c.com/forum/showthread.php?t=106747
    Last edited by blues n twos; 9th January 2011 at 20:11.

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    Regular Member paul_sri150's Avatar
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    Quote Originally Posted by blues n twos View Post
    This sounds familiar

    I had exactly the same on mine last winter and I finally took it in for repair and it turned out to be a cracked rim in two places. It will loose pressure down to a certain psi and then stop.

    It may not be but prepare for the worst.

    I had mine repaired without any further problems for £70. This was a 19" snowflake alloy which tend to be prone to cracks when hitting potholes

    Jon
    I suppose i have been putting it off as i dont want to get told i have a cracked rim lol

    when it becomes more of an issue ill have to get it sorted

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    Regular Member Rebellion8878's Avatar
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    Same thing first time around it was down to 13psi had a nail in the tyre! Second time dodgy Valve kept going down to like 18psi.

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    All those above i agree with now try this.

    Remove the valve core and it will go flat obviously then squirt some fairy liquid into the valve and put some air in to make sure it gets through the hole.

    Now fill the tyre with some water through the valve you may have to submerge it a little then inflate it to 40 psi and watch.

    It will show the leaks with bubbles and this worked a clever idea at the time some 20 + years ago on a cracked alloy the tyre had been changed for another new one but it still went down but this showed the leak.

    The awkward bit is filling with water but when it's submerged in a bath it did, only a pint or two is required on a large alloy.

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