Re: Ebay prices

AMuzi <am@yellowjersey.org> wrote:

On 4/9/2025 5:30 AM, zen cycle wrote:

On 4/9/2025 12:04 AM, Jeff Liebermann wrote:

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."
 
 

 
I can tell you from personal experience that tiny wire bits
do in fact manage to work their way through a bike tire. I
get at least one flat a year that way.

 
+1
 
In theory perhaps difficult but in the actual world all day
long.
 

I don’t even though two if brief sections of my commute are glass and
debris strewn areas one being a flyover the other being a subway both are
arguably the most subpar bits!

But BigApple tyres are have a fairly robustly construction, so tend to
shrug off glass and so on attacks, generally needs something significant to
defeat them, such as nail which I could hear tapping as I rolled along, and
that the tyre was slowly loosing pressure.

Ie no need to try to find the culprit it’s always very obvious! I think I’d
be slightly embarrassed for the bike if it was punctured by just a bit of
wire!

Nice supple road tyres are obviously somewhat different, the old school
roadie has generally coped though it’s tyres are training/commute focused
than summer rubber though does show signs of some minor slashes, probably
from glass, as it’s route does include the flyover if not the underpass.

Roger Merriman