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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Ebay prices
Date: 9 Apr 2025 15:38:15 GMT
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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