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Old 04-13-12, 02:17 PM   #1
AlphaDogg
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Is this tire okay?

After both of the stock tubes on my new bike went flat when I put 100psi into them, I replaced them. I was near my local PBS when my rear tube went flat and because the bike is brand new, they replaced the rear one free of charge. When I got home, I heard a hiss and the front tube went flat. I looked at the holes in both tubes (I kept the flat rear one) and they were in the same place; right where the valve is molded to the tube. I guess this is a sign of cheap tubes.

But I noticed this on the front tire when I was replacing the tube. Is it an okay tire? There are a couple spots on the tire that look like this. The tire is a wire bead Kenda Kadence.

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Old 04-13-12, 02:23 PM   #2
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when in doubt, toss it out..
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Old 04-13-12, 02:29 PM   #3
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I'll head back to the store to see if there's anything they can do (while riding on a different tire).
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Old 04-13-12, 02:37 PM   #4
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Dogg, I don't know about your tire; seems odd. I would agree, "if in doubt, throw it out". A head first crash, due to a bad tire or any reason could be the last worst experience.

As for the tube, I was having similar poor results. That is, the tube would fail right at the valve stem. The local bike shop thought the tires might have been a bit underinflated and the tubes 'walked' around and sheered. This made sense to me because I inflate to minimum possible pressure. Try just a bit more pressure if you continue with the same problem.
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Old 04-13-12, 02:44 PM   #5
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Check the interior of your rims for burrs around the valve hole. That is a common cause of the tube failure you are experiencing. Also, see if the rim tape is good. If it's the thin, slip-prone plastic type, replace it with Velox cloth tape.
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Old 04-13-12, 02:45 PM   #6
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That's weird-looking, but it could just be the way the fabric is when unstressed. The "dents" go away when the tube is inflated?
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Old 04-13-12, 03:12 PM   #7
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That's weird-looking, but it could just be the way the fabric is when unstressed. The "dents" go away when the tube is inflated?
+1 on the same question. Do the dents go away?

I've seen the dents before on tires that were melted or over heated after laying against a hot tube that was just brazed. Or it may be due to some chemical that re-vulcanized the tire in that area and shrank the rubber and casing. You may want to peer inside, and feel if the casing on the underside feels different (e.g. a little crispier and rough) where the dent is. If so, I'd not ride on the tire. If it looks normal and there is no bulge at max recommended pressure, I'd inflate another 15 - 20% over the max and see if the tire head for 20 minutes, and if so, bring it back down to normal and continue riding it.
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Old 04-13-12, 07:18 PM   #8
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+1 Sometimes tires look funky with no air in them. If the tire evens out at normal pressure, it's probably fine.

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As for the tube, I was having similar poor results. That is, the tube would fail right at the valve stem. The local bike shop thought the tires might have been a bit underinflated and the tubes 'walked' around and sheered. This made sense to me because I inflate to minimum possible pressure. Try just a bit more pressure if you continue with the same problem.
I don't agree with this theory. I regularly run MTB tires at ~20psi, I've never gotten a flat that way. Way back before I got a good floor pump my road tires probably got down to 50psi and I never got a flat then either.
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Old 04-13-12, 07:23 PM   #9
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The mechanic at the bike shop said it's probably a twisted bead, and it's nothing to worry about. When inflated, the tire does in fact look normal. I also got some cloth rim tape to replace the plastic rim strip. I took the tubes and cut them into strips and wrapped them on my handlebars as sort of a base layer for my Fizik microtex tape.
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Old 04-14-12, 11:13 AM   #10
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Looks like the same sort of thing that gave my '90 Jeep Cherokee the death rattle.

Glad you had somewhat good news, and that you're taking extra precautions.
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Old 04-14-12, 12:19 PM   #11
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As has been said before, "If in doubt, throw it out". A new tire is much cheaper than a trip to the emergency room and is a lot less painful!
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Old 04-14-12, 12:35 PM   #12
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Quote:
Originally Posted by AlphaDogg View Post

But I noticed this on the front tire when I was replacing the tube. Is it an okay tire? There are a couple spots on the tire that look like this. The tire is a wire bead Kenda Kadence.

Just curious, because it's hard to tell from the photo...

Do you happen to use a trunk mounted rack to transport your bike on your car? If so, you might want to check the rack (with the bike on it) to see if the tire in question is in close proximity to your
exhaust pipe.
It sort of looks like a heat related blemish on the tire. But if the LBS guys said the tire looked OK, it might just be an optical illusion to me.

Alan
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Old 04-14-12, 12:37 PM   #13
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Just curious, because it's hard to tell from the photo...

Do you happen to use a trunk mounted rack to transport your bike on your car? If so, you might want to check the rack (with the bike on it) to see if the tire in question is in close proximity to your
exhaust pipe.
It sort of looks like a heat related blemish on the tire. But if the LBS guys said the tire looked OK, it might just be an optical illusion to me.

Alan
This bike hasn't touched a motor vehicle yet. I rode it home from the shop when I got it and I rode it to the shop for advice.
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Old 04-14-12, 12:42 PM   #14
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No worries...

It's probably just a cosmetic blemish. If the tire was suspect it would have shown it by now. Keep an eye on it, and if it shows any signs of
deformation in that same spot then toss it.

Alan
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Old 04-14-12, 02:03 PM   #15
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I've had Kenda tires that had similar cosmetic blemishes. The blemishes disappeared when the tires were mounted and inflated.
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Old 04-14-12, 03:04 PM   #16
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Does not matter at all if it does not show when inflated. Good chance it's from the tire being tightly bundled with others when shipped to the shop - I've seen similar many times.
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Old 04-14-12, 06:42 PM   #17
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I don't agree with this theory. I regularly run MTB tires at ~20psi, I've never gotten a flat that way. Way back before I got a good floor pump my road tires probably got down to 50psi and I never got a flat then either.
I've known it happen, particularly if it's a loose-ish tyre relative to the rim. Easy for the tyre to pull the tube around. And I regularly see people riding tyres that are less than 20psi.
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Old 07-05-12, 02:44 PM   #18
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The tire failed today at the exact spot pictured above. Threads tore on the sidewall. Luckily I noticed it before it caused a blowout. I first noticed some light dry-rot cracking between the tread and the sidewall, so I brought it to the LBS that was about 1/8 mile away from where I was when I noticed it. The mechanic said that looked to be alright, but he then noticed a sidewall bulge about 4" away from the valve. Threads were visibly torn, so that was the end of that tire. I was going to buy a cheap tire to tide me over until I could afford a set of Conti GP4000s's, but the mechanic said he would look in storage for a used tire for me. He found a folding Conti Gatorskin with very little wear on it (MAYBE 200 miles worth) in a 700x23c (what the torn tire was). He said "here you go. It's yours." So I got a nearly new condition Gatorskin for $0. They normally run $60 iirc, so I got a great deal! I'll head back to the shop when I can afford a matching tire to buy one for the rear. I'll probably switch the current one to the rear and put the new one on the front.

I made sure to destroy the old tire before they threw it out, so nobody could reuse it and get injured due to the sidewall damage. I cut the beads in two different places.

FWIW, the tire had about 1300 miles on it and wasn't showing a terrible amount of wear.
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Old 07-05-12, 02:49 PM   #19
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Huh... good thing you were keeping an eye on it!
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Old 07-05-12, 03:03 PM   #20
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Just saw your thread and I have to say great eye. I manage a Q.A. dept, at my company. My job is failure analysis. When I saw the picture of your tire, it looked like a classic case of a thin wall stressed area and I would have gotten rid of the tire before failure. In the future trust your instincts. If the rubber doesn't look uniform throughout, that means it is not, and the structure of the rubber has been compromised somehow. Don't try to analyze it, just ditch it.
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Old 07-05-12, 04:24 PM   #21
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I'm glad the mechanic noticed it! I didn't even see it. I wonder how many miles I had ridden on it in this condition.

The Gatorskin has a few cuts in the tread, should I fill them with shoe goo? Or should I treat it like a temporary (roughly 300 miles) tire and just get a whole new set?
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