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How worn can a tire get and still work???

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How worn can a tire get and still work???

Old 08-15-18, 09:48 AM
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How worn can a tire get and still work???

Had to show this tire photo!

A few weeks ago a neighbor called and asked me if I could patch a leaking tube on his wife's bike before they went on holidays. I said to bring it over. Before patching I asked if he knew what caused the leak thinking to check the tire for something still embedded to save it from a second leak. He said it was an "abrasion leak". I hadn't heard of an abrasion leak so he ​​​​​​showed me the tire. I had to photo it and show you.

I patched both the tube and the tire which I patched by cutting out an old 4 inch section of tube and gluing the patch inside the tire. I suggested that if he won't replace the tire, he should up his insurance coverage and perhaps start shopping for a new wife in case the current wife gets a blow out and goes over the bars.

I later got him a cheap replacement tire which he says he will install when he has time..... Meanwhile (as of this morning) his wife is still riding this tire.

.
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Old 08-15-18, 11:11 AM
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Tires are worn out when you want them to be worn out. Some will replace tires that seem perfectly good and others will ride stuff like you show. Mostly depends on how serious and how often the person rides. I'd say that one is a gonner. I don't patch tires. Some may, but then you'll likely feel the bump of the patch even if it's on the inside. Similarly I don't used patch tubes for the same reason, though others may patch a tube till there is no more room for patches. Patches for tubes and boots for tires are only temporary fixes to get me home.

If the user only rides this bike a few times a year or so, then patching the tube and putting it back together might let him ride around the neighborhood a few more times. However a little too much air pressure and one or two of those threads getting cut or worn through and the tube might rip the rest and bulge out like a big knot on a tree or even split the tire apart if the rip runs at the time.

I've actually run tires on bare threads too just to see what happens and how long I'd get away with it. Both on the tread and others with the gumwall's cracked and peeling off the side. Except for the one I intentionally over-inflated nothing spectacular happens. It's just another flat.

For leisure time, un-demanding riders, a cheap tire and tube from the big box discount store is more than adequate.
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Old 08-15-18, 11:23 AM
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spectacular!
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Old 08-15-18, 11:32 AM
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I think a tire will hold a tube in the proper shape as long as the casing and beads are intact.

Originally Posted by WGB
Meanwhile (as of this morning) his wife is still riding this tire.

.
The lack of rubber in that spot will make it easier to cut/puncture, but the casing looks undamaged, so I think the tire will work fine (but be more susceptible to damage where the rubber is thin).
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Old 08-15-18, 12:00 PM
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I was just stunned that he took it on holidays and let his wife ride it and that she is still riding it!

I was just about to replace my Gatorskins as they were looking ratty. Might have another 1000 miles on mine if hers are holding


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Old 08-15-18, 12:04 PM
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I argue a little with others about cracked rubber on old tires. But if the rubber is completely gone, I agree it's time to replace.
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Old 08-15-18, 12:07 PM
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The rubber only adds protection and longevity to those threads you see in the picture. The threads are the actual significant structural part of the tire, besides the bead material that adds strength. So cuts, cracks and thinness in the rubber aren't in themselves an issue other than to assess how often you are encountering stuff that might eventually cause you to be late getting home.

Last edited by Iride01; 08-15-18 at 12:12 PM.
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Old 08-15-18, 12:08 PM
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I would not want a weak, questionable, tire on the front wheel.
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Old 08-15-18, 12:42 PM
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Originally Posted by fietsbob
I would not want a weak, questionable, tire on the front wheel.
Oh but why? Front tire blow outs are so much fun, especially downhill at speed. I replace when I can see cords from the outside.
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Old 08-15-18, 01:06 PM
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When I see cord or a major cut on the rear I toss it and put the front on the back and put a new one on the front.
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Old 08-15-18, 01:36 PM
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Originally Posted by WGB
... and the tire which I patched by cutting out an old 4 inch section of tube and gluing the patch inside the tire. ...

.
Patching the inside of a tire with a tube does little if there is a structural issue with the casing or a large hole (or even a small hole in a high pressure road tire). You need a material that is both strong and does not stretch. I suspect your neighbor will get by but it appears in that photo there is a cut in the casing below the casing you can see. (When you pumped it up after patching, did the tire distort in that area?)

Really good patch material is real dacron sailcloth. If you have water and sailing nearby, visit a sailmaker and ask for a scrap of dacron appropriate for a racing dinghy. Make the patch much larger than the cut. G;lue it in with contractor's grade contact cement (the stuff with all the warnings of bad solvents. Heed the warnings.)

Ben
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Old 08-15-18, 05:16 PM
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No, tire didn't bulge but I will watch out for the dacron. I bet a small piece could fit in a seatbag instead of carrying a backup tire and leave way more room. Patch hole in tire with dacron covered liberally with patch glue, insert spare tube, pump up but not too full and stumble home. Saves carrying a folder when biking on my home bike incase of a blowout.

And, no I personally don't want a blowout on a downhill. I had one and it was so loud I thought someone had shot at me.
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Old 08-15-18, 08:34 PM
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Originally Posted by 79pmooney
Really good patch material is real dacron sailcloth.
Best bang for the buck (pun intended) tire boot patch is a good old USA dollar bill
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