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First Flat tire! Was the blow out my fault?

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First Flat tire! Was the blow out my fault?

Old 10-15-15, 07:57 AM
  #1  
pat0115
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First Flat tire! Was the blow out my fault?

I had my first flat tire today. It was my 3rd ride on my new Cannondale Quick Speed 1. My question is: Can an overinflated tire cause a blowout?I filled my tires before I rode this morning and I might have put more than 100 psi in my rear tire. I was told that underinflated tires can cause a pinch flat, so that was why I went over the 100 psi.
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Old 10-15-15, 08:21 AM
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If you had an actual blow-out, it was most likely (but not for certain) caused by the tube being 'pinched' under the tire bead. That max pressure on the sidewalls includes a safety margin, and it's unlikely that a little over-pressure, by itself, would cause any problems.
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Old 10-15-15, 08:44 AM
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I blew out both tire and tube about a week ago when I hit a hidden pothole. Did you do something like that just before it blew?
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Old 10-15-15, 08:50 AM
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Originally Posted by hoodat View Post
I blew out both tire and tube about a week ago when I hit a hidden pothole. Did you do something like that just before it blew?
No, i didn't hit anything at all. Traveling on a smooth path and I was coming up a slight hill when I got the blow out
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Old 10-15-15, 08:57 AM
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By blow out, do you mean it physically popped or it just went flat? Inspect your tube to see how much damage there actually was.
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Old 10-15-15, 09:05 AM
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Blow Outs are coming thru a tear in the tire casing (both are toast), Blow Offs are the tube pushing the tire off the rim.
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Old 10-15-15, 09:16 AM
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I had headphones on and I still heard the loud explosion when the tire blew. There is a large tear in the tube but the tire itself is perfect
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Old 10-15-15, 09:51 AM
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Tube pinched under the tire bead would be my guess. It's the fault of whoever mounted the tire.
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Old 10-15-15, 10:04 AM
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Originally Posted by wphamilton View Post
Tube pinched under the tire bead would be my guess. It's the fault of whoever mounted the tire.
Most likely.
I would run 28s under 100 psi anyway.
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Old 10-15-15, 11:04 AM
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I have 30's on my Quick Speed 1
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Old 10-15-15, 11:14 AM
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Originally Posted by wphamilton View Post
Tube pinched under the tire bead would be my guess. It's the fault of whoever mounted the tire.
Most likely explanation. Also, there's no reason to pump 30mm tires to 100psi. 85-90 should be more than enough.
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Old 10-15-15, 11:20 AM
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Originally Posted by BlazingPedals View Post
If you had an actual blow-out, it was most likely (but not for certain) caused by the tube being 'pinched' under the tire bead. That max pressure on the sidewalls includes a safety margin, and it's unlikely that a little over-pressure, by itself, would cause any problems.
+1. Back in the 90s there was a Philly edition of Interbike. I got to go and ended up taking with a rep from Conti. The rep told me that the max pressure rating on the sides of their tires was way lower than what they could handle without damage. He blamed the ratings on the company's lawyers.
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Old 10-15-15, 11:33 AM
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My LBS told me to make sure I am at 100 psi before each ride
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Old 10-15-15, 11:55 AM
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Originally Posted by pat0115 View Post
My LBS told me to make sure I am at 100 psi before each ride
As Caloso pointed out, seems very high -- especially for 30mm tires. How much d'you weigh?
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Old 10-15-15, 12:20 PM
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Originally Posted by wphamilton View Post
Tube pinched under the tire bead would be my guess. It's the fault of whoever mounted the tire.
I agree with this because it has happened to me when I did a poor job of mounting the tire after a flat.
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Old 10-15-15, 12:25 PM
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Pat: From bicycling.com:

Pump It Up

Proper tire pressure lets your bike roll quickly, ride smoothly, and fend off flats. Narrow tires need more air pressure than wide ones: Road tires typically require 80 to 130 psi (pounds per square inch); mountain tires, 30 to 50 psi; and hybrid tires, 50 to 70 psi. To find your ideal pressure, start in the middle of these ranges, then factor in your body weight. The more you weigh, the higher your pressure needs to be. For example, if a 165-pound rider uses 100 psi on his road bike, a 200-pound rider should run closer to 120 psi, and a 130-pound rider could get away with 80 psi. Never go above or below the manufacturer's recommended pressures.

* * *
The tires on my road bike at 25cm. I generally pump them up to 100psi. My touring bike the tire is 28cm. I pump that up to 90psi. The wider the tire, the less the psi. Most tires indicate a high/low psi... generally ideal is somewhere inbetween.

Also check the tube... if the split is at a seam could be old or defective tube...
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Old 10-15-15, 12:49 PM
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Tires and rims vary a little in circumference. So some tires fit looser on the rims and you will find that some rims also fit looser. If both are a loose fit, it can be hard to ensure the tire is mounted an even adn acceptably large distance inside the rim. Get tires with that loose fit a little cockeyed so it is low in one area and high in another and you may have very little tire inside the rim at that high spot. And it could just blow off, even tin no tube pinched here. A good check is to spin the wheel after mounting the tire and putting a little air in (say 25 pounds). Spin the tire and see to it that the molded line on the tire just outside the rim stays an even distance above the rime. (It may well be so close to the rim you do not see it until you look carefully. See to it that it does not dip into the rim or hop above. Do both sides.

Not passing this test when you have a loose fitting tire can have real consequences. I did a hasty tire mount with an old tire of the loose variety on a smallish rim. 8 miles later when I was going ~25 mph, the rear tire blew off with a load explosion. I rode the aluminum rim for what felt like forever, trying to bleed off speed and not hit the curb; it was like riding on ice. Then, suddenly, the tire jammed n the seatstay, tossing me off and costing me a mile of skin and collarbone.

Always do that tire bead line check. If nothing else, you get to ride rounder tires for a smoother ride. And if the bead is consistently too loose with that tire rim combo, consider changing either one to a better fit. (There are also tight-tight combos that are near impossible to mount but that is another chapter of the same story.)

Ben
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Old 10-15-15, 04:49 PM
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My LBS replaced the tube no charge today, since I only bought the bike a week ago. When I asked why it happened, he said it was probably a defective tube. But, he did say it would probably be best to go 80-85 psi now, instead of 100. He said that should be enough psi (I'm 220 lbs) and will give a more comfortable ride. Would 80-85 for 30's be OK? Don't want another blown tube but I also don't want a pinch flat either
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Old 10-16-15, 06:57 AM
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Originally Posted by pat0115 View Post
My LBS replaced the tube no charge today, since I only bought the bike a week ago. When I asked why it happened, he said it was probably a defective tube. But, he did say it would probably be best to go 80-85 psi now, instead of 100. He said that should be enough psi (I'm 220 lbs) and will give a more comfortable ride. Would 80-85 for 30's be OK? Don't want another blown tube but I also don't want a pinch flat either
It's unlikely he'd tell you he screwed up, so just accept his excuse for now. It might be a good idea for you to learn how to replace your own tubes properly, if for no other reason than to check his work. 100+ psi might be fine for a 23mm tire; but the fatter the tire, the less pressure you will need. 80-85 psi should be fine for a 30mm tire.

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Old 10-16-15, 07:30 AM
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Originally Posted by wphamilton View Post
Tube pinched under the tire bead would be my guess. It's the fault of whoever mounted the tire.
Yeah, that would be my guess too. It's really pretty common because it's so easy to do. I think that taking a minute to check both sides of the bead all the way around is a worth while precaution when changing an inner tube.

Using over sized tubes increases your odds of a blow off. Whenever I'm given the choice of using a slightly over sized inner tube or one that's marginally too small, I'll pick the small one because it's easier to tuck it completely up in the tire cavity.

I also think that using higher than necessary tire air pressure increases your tire blow off potential. Using uber high tire air pressure is definitely falling out of style. I NEVER used to ride my road bike without topping up the air pressure to 120 psi. Then, a couple of decades ago, I experimented with using 100 psi front/110 psi rear on my tandem with 700 X 28 mm tires. We never had a pinch flat and we weren't any slower than previously, but we enjoyed a noticeably smoother ride. I never went back. I haven't used more than about 90 psi on any of my bikes in a very long time.
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Old 10-16-15, 07:38 AM
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This one had been in the tire for 400 miles when it blew out.

Cause never determined.

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Old 10-16-15, 01:00 PM
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A pinched tube can just sit there like a ticking bomb. Last year I changed my front tire 2 weeks before a tour. On the 3rd day of the tour, my tire suddenly starting making a funny noise so I pulled over and discovered the tube was just poking out from between the rim and tire but hadn't blown yet. I quickly deflated it, worked the tube back inside the tire, and re-inflated. I got lucky, no blowout! I probably did 400-500 miles before it showed up, though!
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Old 10-16-15, 02:02 PM
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That's an advantage of the heavy duty so called thorn proof tubes. They are so thick it's all but impossible to pinch them. IMHO though there is actually no such thing as a thorn proof tube. Thorn resistant maybe but if a thorn stays in the tire long enough it will work through any tube.
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Old 10-16-15, 02:10 PM
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Originally Posted by 10 Wheels View Post
This one had been in the tire for 400 miles when it blew out.

Cause never determined.

That's long split for just a blowout. Looks more like a defective tube.
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Old 10-17-15, 12:46 AM
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The tire should have a max psi (or range) that the tire can handle. The LBS guy already gave you bad info. I would trust the tire manufacturer. From your description it does seem like the tube was pinched by the tire. I've never had a blow out, but I have had pinch flats, one from a pot hole and one when changing tubes. I have since learned to watch the road better :-) and how to change the tube to minimize the chance of pinching the tube.

PS. If you have a flat, you need to run your finger along the inside of the tire to make sure there is no piece of glass or whatever that is still in the tire waiting to put a hole in your new tube once you start riding on it. Been there done that :-)

It sounds like you have a good LBS if they replaced the tube for free.
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