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Would you ride these cracked sidewalls?

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Would you ride these cracked sidewalls?

Old 02-01-17, 06:22 AM
  #51  
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Originally Posted by curbowman View Post
Look the ones that came with a bike I got recently. Fortunately, the former owner included a set of brand-new tires. Oddly enough, the black part looks intact.

Do you think I could cut the black part to use it as a puncture barrier inside the new tires?
Those are fine.
Just because something is blemished doesn't mean it needs to be thrown away.
Like the billions of pounds of food thrown out every year because a brown speck.
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Old 02-01-17, 07:45 AM
  #52  
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Originally Posted by smarkinson View Post
I shall quote the great and almighty Sheldon Brown:

"Once the fabric has been woven between the beads, and the tire has its basic shape, it is coated with rubber. The rubber is mainly there to protect the fabric from damage, and has no structural importance.

The rubber that comes into contact with the ground is called the "tread." This area usually has thicker rubber than the "sidewalls" of the tire, mainly for wear resistance. Most tires have some sort of 3-dimensional pattern molded into the tread, which may or may not enhance traction"


On the matter of skinwall tyres:


"Skinwalls have either no rubber on the sidewalls, or a very thin layer. This, too is an attempt to make the sidewall more flexible and reduce rolling resistance."


Bicycle Tires and Tubes
I would disagree with that assessment. The rubber definitely has a structural importance. It holds the fabric together, prevents it from bulging and provides some rigidity. I've never run across a skin wall tire that had no rubber on the sidewalls. They have less but there is still rubber there.

I have seen tires where the rubber has been degraded to the point where there is no rubber left and the tire simply won't hold shape nor keep the tube from squeezing out of the fabric. Look at the last picture in rumrunn6's post. I've seen lots of tires like that only worse. That tire, by the way, is a skin wall and you can see there is a significant amount of rubber left in the fabric.
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Old 02-01-17, 11:02 AM
  #53  
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Does an "over the bars" accident sound like an interesting new experience to you? I watched one once and believe me, it was ugly. So, do the one thing many of your bike forums advisers can't stand, and break out some green. bk
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Old 02-01-17, 11:56 AM
  #54  
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Originally Posted by SquidPuppet View Post
That is exactly my point. It IS a waste of money and it IS the tire's fault. Four years is way too short. I have tires that are 16 years old on a bike that's only ridden about 200 miles each summer. It's stored in sub freezing temps for months on end in the winter and is exposed to 100+f sunshine all summer. No cracks in the sidewalls. No indication of decomposition. Good tires are good tires. Tires of low quality rubber fall apart prematurely. I know they exist because I've had a few sets, and won't buy the brand that let me down again.
Ozone exposure is as much, if not considerably more, of a factor in the longevity of rubber: https://en.wikipedia.org/wiki/Ozone_cracking

In qualifying many automotive components, ozone exposure is a test defined by ISO and utilized by most of the OEMs. I can run plastics in a thermal chamber and run them from -40C to 105C for weeks at a time, with little change in appearance, but ozone can easily destroy those same parts.
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Old 02-01-17, 12:16 PM
  #55  
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Originally Posted by jefnvk View Post
Ozone exposure is as much, if not considerably more, of a factor in the longevity of rubber: https://en.wikipedia.org/wiki/Ozone_cracking

In qualifying many automotive components, ozone exposure is a test defined by ISO and utilized by most of the OEMs. I can run plastics in a thermal chamber and run them from -40C to 105C for weeks at a time, with little change in appearance, but ozone can easily destroy those same parts.
It is my understanding that many rubber products contain additives to prevent ozone cracking. I assume then, that some bicycle tire manufacturers have developed recipes that include such additives, and some have not.

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Old 02-01-17, 12:55 PM
  #56  
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Take the tire off and hold it up to light. If you see areas that are thinned out, I'd replace it.
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Old 02-01-17, 01:23 PM
  #57  
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Originally Posted by bkaapcke View Post
Does an "over the bars" accident sound like an interesting new experience to you? I watched one once and believe me, it was ugly. So, do the one thing many of your bike forums advisers can't stand, and break out some green. bk
Try BTDT! November 2012 did a 180 landing on the back of my head and right hip at the same time. My helmet did it's job and saved me from a hospital trip and significant head injury.

Definitely factored into the thought process....
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Old 02-02-17, 08:47 AM
  #58  
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Originally Posted by SquidPuppet View Post
It is my understanding that many rubber products contain additives to prevent ozone cracking. I assume then, that some bicycle tire manufacturers have developed recipes that include such additives, and some have not.
There are additives but they can only slow down the problem. Another issue is ozone concentration. How and where it can form is dependent on many different factors. Being near electrical motors almost guarantees high ozone levels but there are lots of other opportunities for ozone formation.

Ozone can form photochemically from a variety of volatile organic compounds. Unburned hydrocarbons from fuels are one source. Formaldehyde outgassing from wood products like the walls of a "shed" could be another source. I work in a laboratory building where rubber products don't last long due to the 10,000 possible chemicals that could form ozone.

I, too, have little problem with tires cracking but my bikes are stored in a 60 year old cinderblock garage with minimal amounts of wood around and certainly few composite (aka "plywood") sources around for chemicals to outgas. But I can see how storing a bike in a "shed" assuming a relatively new (<25 years) wooden plywood shed could be detrimental to any rubber product.

I still convinced that this isn't the fault of the tire...I have the same brand on some of my bikes that are nearly 4 years old and they aren't showing any checking...but a storage problem.
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Old 02-02-17, 10:20 AM
  #59  
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Originally Posted by cyccommute View Post
There are additives but they can only slow down the problem. Another issue is ozone concentration. How and where it can form is dependent on many different factors. Being near electrical motors almost guarantees high ozone levels but there are lots of other opportunities for ozone formation.
Exactly correct. Store the same type of tire next to a furnace and in a dark, cool cellar, the one by the furnace is likely going to crack much faster. Some good information here on the ozone process: Technical FAQ: Taking care of unused tires | VeloNews.com
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Old 02-08-17, 09:22 AM
  #60  
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All right, so here are the replacements. 27 x 1 1/4 (630x32c) Gatorskins

I have a pair of 700x32c Hardshells on another bike which I really like, so decided to go with the regular Gatorskins as replacements on this bike. Unmounted they look a lot wider than the Hardshells, but right now I have winter tires (Conti Top Contact Winter II's) on those rimes so will wait until Spring to compare. These measure right at 1.25" on the front and 1.22" on the rear.

[IMG][/IMG]



As expected they are comfortable and roll easily. Looking forward to putting some more miles on them!
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Old 02-08-17, 10:25 AM
  #61  
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cool. how were they to mount?
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Old 02-08-17, 10:35 AM
  #62  
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Originally Posted by rumrunn6 View Post
cool. how were they to mount?
Not bad at all. The cold made it difficult to get the old ones off. These seated well though I did use a tire lever once on each to get the last 3" in. If it were Summer I might have been able to do it by hand.
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Old 02-08-17, 11:43 AM
  #63  
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Originally Posted by stevel610 View Post
cold made it difficult to get the old ones off
I asked cuz I was mounted some tires in my basement last night & had the space heater on. while I worked on the 1st one I positioned the 2nd one closer to the space heater. never got to it tho cuz I had to hassle with the front fender. I'll get back into it tonite. 2 more tires to mount as well. used a little body powder on a rim for the 1st time last nite as well
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Old 02-09-17, 09:52 AM
  #64  
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I had the devil of a time trying to mount Gatorskins (700X28c). Lubing the rim with liquid soap helped.
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Old 02-09-17, 09:58 AM
  #65  
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mounted another tire last night. used the powder again. kinda messy. got two more to mount today
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