Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Very Slow Leaks.
Date: Tue, 6 May 2025 15:41:05 -0500
Organization: Yellow Jersey, Ltd.
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On 5/6/2025 3:24 PM, Jeff Liebermann wrote:
> On Tue, 6 May 2025 14:50:00 -0500, AMuzi <am@yellowjersey.org> wrote:
> 
>> On 5/6/2025 2:43 PM, Jeff Liebermann wrote:
>>> On Tue, 6 May 2025 14:52:02 -0400, Frank Krygowski
>>> <frkrygow@sbcglobal.net> wrote:
>>>
>>>> I doubt that's a real problem. I'd imagine any wires would be lodged in
>>>> the tire, not in the tube.
>>>
>>> How could the fine wires cause an air leak without puncturing the
>>> inner tube?  I could drill a small hole in the tire and as long as the
>>> inner tube is doing its job, the tire will function (fairly) normally.
>>>
>>> One exception is if you're riding on tubeless tires, which don't have
>>> an inner tube.
>>>
>>
>> I've never seen such.  The object is normally snug in the
>> tire casing and protrudes (more or less or a lot less)
>> through the casing until it just nicks the tube.
> 
> OK, got it.  I mistakenly assumed that "lodged in the tire" meant that
> it had also punctured the inner tube.  However, if there is an air
> leak, I still think it's a good assumption that the leak is in the
> inner tube and not necessarily in only the tire.
> 
>> Rarities include objects which pass right through the tire
>> and are found flopping around in the casing after the tube
>> is removed. These are typically large objects, larger than
>> 3mm. I've never seen an object fully inside an inner tube.

"the leak is in the inner tube and not necessarily in only 
the tire."

Absolutely and exclusively in the tube.

In fact, many tires (non-tubeless) are quite permeable. This 
is observed when changing a flat on a wet tire- bubbles 
appear along the sidewalls while inflating as the air 
between tube and casing is forced out.

The casing fabric need only be intact and uniform, not 
airtight.  Tread is nice but not critical (you can ride, 
just maybe not so far as the casing will abrade and shred). 
Damaged (bruised or sliced) casings will appear lumpy or 
squiggly like scoliosis and ought to be replaced at the 
rider's earliest convenience as the fabric will continue to 
tear away from the injury. Destroyed casings are anything 
with a hole or slit big enough to see through (maybe larger 
for low pressure MTB tires) . Those will not contain a tube 
under riding pressure and must be replaced.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971