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My front tyre has been loosing air over a 2-3 week period and was almost flat at one point after not using it for a short period.

lost about 6 psi in less than a week.

It had a new K177 fitted last year and only a few thousand miles done since.

This morning I put pressure unto 50psi and went round the whole rim, valve, tyre with soapy water.

Could not find a thing to explain loss of air.

Next I was going to remove tyre and take it too garage so they can submerge whole wheel.


Any thoughts or bright ideas before i do this ?

thanks
 

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Robin ... if you have an OEM air valve, try flexing it a little bit, while soaking the area around it with soapy water. More often than not, they begin to tear and leak but are hard to detect, unless moving it around a bit, which simulates actual usage. That's why I switched type/make of air valve.

If that's not it, I suspect that the bead area of the inner rim wasn't cleaned before installation of new tire, .... barring any puncture in the tire itself. :?
 

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Nail in tread, still in there = slow leak..
 

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I have the same problem, i looked and looked and could not find the leak, tried soapy water,new valve core, wiggled the stem, no luck.

Finally modified a plastic tub to submerge part of the tire and rim under water and wa la !!! found 3 very, very small trickles of smaaaal trickle of bubbles at the bead. Will have to remove the tire at some point and hopefully get it sealed.

Good Luck Jim
 

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Cant see any nail.

Yes its an OEM valve and stem, it was new last year but worth a wiggle to see if its that.

I put loads of soapy water around the rim, to see leak there, nothing.

Cheers
 

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thats horrible stuff. :-(

When I changed tyre it had slime inside wheel which had gone rancid.

(fitted by previous owner).

I use dyno beads for balance which so far have worked very well (no beads stuck in valve, I have checked ).






.
 

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Robin- As i said i tried the soapy water and bubble blower stuff ( use to use it to fing propane leaks ) and not untill i submerger the tire and rim did i find the leak, and even then they are very small and hard to see.

Jim
 

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Thanks Jim

Will give that a go, I have a sneaking feeling about the rim bead.

Just need to find a big bucket :)
 

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Check the valve stem Core... confirming that it is tight.

Also, since the core's sometimes leak, it is good insurance to use a valve stem Cap that has an O-ring inside it, to stop any leakage from the valve core.
 

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Hi Alex,

thanks, I put in a new core first time I noticed it was going down, I will recheck how tight it is.

Getting stem caps with o rings in always seems to be a problem, reminds me to order some more off ebay.
 

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Are you using Dynabeads to balance the tire?... many people have experienced leaks, resulting from the beads residing in the valve stem, causing it to not fully seal.
 

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yes I am using dyne beads and have made sure the valve core is bead free, no air is coming out of valve.

I am going to have to remove wheel and put in water as next stage to see where its leaking from.
 

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My tire never goes flat, but it seems to love about 30PSI LOL

I air up to 42PSI and sometime later it's at about 30PSI.
Only seems to leak down when sitting.

I let the wing sit about a week, checked air to go for a ride, 40PSI

Never have found any bubbles but I have not taken the wheel off for a bath yet either.
Long as I air up before riding (if needed) tire does not loose the air till it sits at least over night or longer.
 

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usually the shop will just swap em out and dont give a [email protected]#@#$
how gummed or crusty the rim is...you or who? needs to do this task personally once and a while to detail and clean the rim up good or this fun issue can plague you thru the life of the rim.
 

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Soapy water doesn't always find a leak but submersion will.
 

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Agree as found zip with soapy water, wheel is coming off in a few days to do just that.
 

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i've found that windex will find a small leak quicker than soapy water
 

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A wheelbarrow works good to put water in.
 

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Dusty Boots wrote:
Robin ... if you have an OEM air valve, try flexing it a little bit, while soaking the area around it with soapy water. More often than not, they begin to tear and leak but are hard to detect, unless moving it around a bit, which simulates actual usage. That's why I switched type/make of air valve.

If that's not it, I suspect that the bead area of the inner rim wasn't cleaned before installation of new tire, .... barring any puncture in the tire itself. :?

Grambo Wrote:
usually the shop will just swap em out and dont give a [email protected]#@#$
how gummed or crusty the rim is...you or who? needs to do this task personally once and a while to detail and clean the rim up good or this fun issue can plague you thru the life of the rim.


That's why whenever I change mine, or anyone else's tire, I always scrub/clean the inner lip of the rim, where it makes contact with the tire's bead.









The insides of my rims are cleaner than the outsides! :D
 
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