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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Ebay prices
Date: Tue, 08 Apr 2025 21:04:47 -0700
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On Tue, 08 Apr 2025 18:29:26 -0300, Shadow <Sh@dow.br> wrote:

>On Tue, 8 Apr 2025 13:06:16 -0400, Frank Krygowski
><frkrygow@sbcglobal.net> wrote:
>
>>On 4/7/2025 2:01 PM, cyclintom wrote:
>>> On Sun Apr 6 19:12:56 2025 Frank Krygowski  wrote:
>>>> On 4/6/2025 6:04 PM, cyclintom wrote:
>>>>>   
>>>>> Yesterday, I was fixing flats on three different bikes. I went up to Robinson's and picked up some new tubes because the flats are all pin holes and I've never successfully repaired those. I fix one hole and another appears 3 inchs away. Nothing in the tire.
>>>>
>>>> Wow. So many problems!
>>> 
>>> So now Frank is telling us that he never gets flats. 
>>
>>Not at all, Tom! I've described here getting something like three flats 
>>within 15 miles. I've described other flats as well. Flats are a normal 
>>part of bicycling.
>>
>>But I do know how to successfully fix flats. Your "I've never 
>>successfully repaired those. I fix one hole and another appears 3 inchs 
>>away." is very, very unusual.
>
>	If there's a piece of fine wire in the tire repairing the
>inner tube will not prevent a flat a few minutes later.
>	Fine wire is very common in our asphalt, which is made of
>recycled truck/car tires (plus other stuff). It's the tires that have
>those nasty stainless steel wires.
>	I always run my finger round the inside of the tire before
>replacing the repaired inner tube. I usually simultaneously find the
>culprit and puncture my finger..
>	[]'s

Ouch.  I use a small cotton ball for locating splinters.  It should
also work for steel wires.

Examples:
<https://www.bikeforums.net/17442640-post6.html>

(from Sheldon Brown):
<https://www.sheldonbrown.com/flats.html#tireinspection>

I'm not quite ready to become a believer but it's a start.

I ran some crude tests to see what it would take to manually force a
thin wire through a bicycle tire and tube.  I started with the wire
perpendicular to the tire.  If the wire was to thin, it would buckle
as soon as it touched the tire.  Same if the wire arrived at an angle,
same buckling.

A heavier wire would buckle less but unless the wire was really stiff,
it would not break the surface of the tire.  I could almost push a
sharpened bicycle spoke through the tread, but anything that was
moderately flexible would buckle before penetrating.  If someone has a
way to demonstrate how a wire from an automobile tire might penetrate
the bicycle tire and tube, I want to try it.

The use of recycled tires for Rubber Modified Asphalt (RMA) was also
mentioned.  Supposedly, the steel is removed from the shredded tire by
magnetic separation:
"Maximizing metal removal in rubber tire recycling"
<https://www.recyclingproductnews.com/article/33699/maximizing-metal-removal-in-rubber-tire-recycling>

"Steel-belted tires a source for flats"
<https://rayhosler.wordpress.com/2016/05/15/steel-belted-tires-a-source-for-flats/>
"A vibratory feeder feeds rubber crumb onto a high intensity magnetic
field of the head pulley, pulling out tiny wires that may still be
embedded in the crumb rubber material. This results in an extremely
pure product."


-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558