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Discussion Starter #1
My rear tire (battlewing) is losing about 4 lbs of air per day.
There is a plug in it, but that's not where it's leaking from.
There are no screws/nails/glass in it.
I've pumped it up to 50 psi and coated it in soap water and can't find the leak.

I'm stumped...
 

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Four pounds a day is a leak that should show up. I say submerge the entire tire/rim? I suspect the valve stem and I base that on almost nothing.

Oh, sometimes over inflating a tire can make it leak slower.
 

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I wonder if it might be a rim leak or maybe the valve stem?


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duck

I had a plugged tire once that never leaked when I checked it, yet I still lost pressure, but only when I was riding, not when parked, even overnite

after a week or so, I started getting a thump when I rode

what I discovered is that my puncture separated some plies or somethin and it took riding to pump air thru the leak

only time I ever replaced a punctured tire before the tread was worn



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Can you find a trough you can slide under the wheel so you can fill it with water and rotate the rim through it? Saves taking the wheel off.
 

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Can you find a trough you can slide under the wheel so you can fill it with water and rotate the rim through it? Saves taking the wheel off.
Good idea. Like a window planter liner.
 

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Discussion Starter #7
I'll try immersing the tire...

I have to check if it loses air only when riding or only when sitting; good idea randy; thanks for mentioning it.
 

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duck

I had a plugged tire once that never leaked when I checked it, yet I still lost pressure, but only when I was riding, not when parked, even overnite

after a week or so, I started getting a thump when I rode

what I discovered is that my puncture separated some plies or somethin and it took riding to pump air thru the leak

only time I ever replaced a punctured tire before the tread was worn


Yes, check this. Not sure how, exactly -- just look for something that looks funny around the patch, I guess?

Also, centrifugal force can do funny things to valve stems... check that the stem doesn't leak when you flex it around. Also check that the valve core is reasonably tight but not too tight. Or try unscrewing the valve core partway until air is blowing out and then reseating it. Or just replace the valve core -- they're only a couple of cents each.
 

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Hi Everyone, Slow leaks like this are often one of two things,

Check your valve stem to be sure it is good and that it is turned in all the way,

Motorcycle tires periodically have beading issues. You can pick up bead seal at tire or auto parts shops. not to be confused with the Slime products that are sometimes used by people to fix tire leaks from the insider,

If you put your bike up on stands, and use a spray bottle and water and spray it on the rim and bead of the tire as you rotate slowly you will find the leak, I had one once that was so slow you could watch the bubble form up and burst,

Remove the tire and use the bead seal if this is the case with your tire,

It is caused by the way the rubber is sometimes left on the bead area when the tire comes out of the mould,

Enjoy the ride, and best regards,
Blair
 

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Discussion Starter #11
Blair: my tire was installed over 16,000kms ago... wouldn't a problem with bead seal manifest itself earlier?
I'll check the valve internals; I have the tool fro removing it with my slime kit (I bought it for the compressor)
 

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Blair: my tire was installed over 16,000kms ago... wouldn't a problem with bead seal manifest itself earlier?
I'll check the valve internals; I have the tool fro removing it with my slime kit (I bought it for the compressor)
16,000 is a good bit of miles on a bike tire. You may be due for a change soon, especially with a plug in it as well,

When you do change out the tire, Take brake cleaner and spray it around the inside edge of your rim where the tire beads and make sure all those surfaces are clean before you put the new tire onto the rim. it will remove build up the is a challenge for the tire beading properly as well.

Enjoy the ride, and best regards,
Blair
 

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A trick on cars back in the day was to use a razor blade to make a tiny slip in the base of the valve stem on the inside. If properly done it would hold air stationary but leak when moving

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Discussion Starter #15
The tire loses air just by sitting there.
I just went out and removed the valve core, and it looked allright.
I reinflated the tire to 37.5 psi and will see where it is tomorrow.

In any case, I will be buying new tires next week (I'm 3 mm away from the wear marks).
I was going to get the Battlax BT45V, but I just realized that those Battlewings had been on there for 20,000 kms, so I'll get the same tire again; I'm definitely getting my money's worth out of them.
 

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What's worked for me is to soap up the tire and stem well, one side at a time and then very slowly rotate the tire. If there's a leak you'll see it but it's not always obvious as the bubbles can be small. A good lighted shop helps. I've had 4 leaks in the past month, 3 on my 5th wheel and one on the bike. The bike one was coming from the valve stem pressure indicator which had it's cap busted. I put those on so I could see at a glance if the tire pressure was OK but now I"m wondering if they are safe to use. Anyway, the rv leaks were one at the bead (rusted rim) and two on the valve stems which the tire company that just put new tires on had forgot to tighten back up. Now I"m a leak specialist.
 
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