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Tire blowout prob

Old 08-01-12, 11:32 AM
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Tire blowout prob

Hi there guys, I just have a quick question...but of course here is a short explanation.

I just got a new road bike that has 700x20C tires on it. The other day I got a flat in the rear. I fixed it the next day and 10 mins. into the ride I got a flat again.
There could be multiple reasons for this that I have come to. The tires are a little old...and there is no tape between the wheel and the tube. I have just ordered new tape and new 700x23c so hopefully that will fix the prob

Ok, now to the question.
Could it POSSIBLY be, that I am too heavy for the bike? I am about 200lbs and the tire pressure is at around 120psi
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Old 08-01-12, 11:34 AM
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Flats are part of riding.

Your weight is fine.

Always install the tire where the lable is centered on the tube valve.

This will help you determine tube leak locations on your next flats.
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Old 08-01-12, 11:36 AM
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700x20C is a little "small" for our size, but I suspect the actual culprit is your lack of rim tape.
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Old 08-01-12, 11:37 AM
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I agree. Your weight is not an issue. Check for sharp objects embedded in the tire and put the rim tape on. Look at the tube. Where is the hole? Same place both times?
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Old 08-01-12, 11:42 AM
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I would bet the lack of tape on the rim is the culprit here...
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Old 08-01-12, 11:46 AM
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^That tire instal idea is a great one. I'm still fairly new to biking, I threw the first tube out already so I can't tell if it is the same spot. I hope the tape is the problem, that is what my buddies who ride bikes with me thought. I also got slightly bigger tires 23c instead of 20c because the tires now have a TINY bit of the old cracking rubber thing going on and I figured it couldn't hurt to get new tires.

Glad to hear it isn't the weight, my one buddy suggested it in joke...but it actually got me thinking.
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Old 08-01-12, 11:48 AM
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Is it a simple flat or a blow out?
Where's the hole in the tube?
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Old 08-01-12, 11:49 AM
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Sometimes buddies can joke and be mean.

I weight 212 lbs. Ride about 12,000 miles a year.
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Old 08-01-12, 11:52 AM
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We get little pieces of metal that look like staples that come from the cars radial tires and they are difficult to see and remove and sometimes you change the tube and a few minutes later the new tube is punctured. Some times the only way you find them is to feel the inside of the tire with your fingers. Unfortunately that usually results in sticking myself in the finger and I find the little wire through the blood and pain
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Old 08-01-12, 12:02 PM
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No tape? As in rimtape? Actual blowout or flat? Rimtape is most needed and find out why the tube got flat. Do not just keep swapping in tubes, whatever caused first tube to go flat is probably still there.
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Old 08-01-12, 12:40 PM
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Mirroring things said above:
Don't ride without rim tape.
If you get a flat, be very thorough in your search to find its cause, or you will be doomed to repeat.


Probably was a good idea to replace those tires, if they were cracked (old? Dry rotted?). If the tubes were in a similar state, that may have been the culprit.


Something to keep in mind: Skinny high pressure tires will likely need to be pumped every time you ride. Just make it a part of your riding "pre-flight check". While you are not too heavy for skinny tires, you are still heavy enough to pinch your tubes if they're under-inflated.
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Old 08-01-12, 01:15 PM
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Too bad you threw the tube out already... I had to replace the rim tape in my wife's wheels because the innertube was dimpling where the spoke holes were, and blowing out there.

Unless you got some debris inside your tire that's repeatedly causing your flats, you should be fine.

When you eventually replace your tires, get 23mm or 25mm tires, they're more common these days and more comfortable to boot.
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Old 08-01-12, 03:54 PM
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you might just need to pay better attention when putting the tube back in. Pinch flats are common when you don't make sure the entire tube is within the tire before you start inflating.
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Old 08-01-12, 05:50 PM
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Originally Posted by RedC
We get little pieces of metal that look like staples that come from the cars radial tires and they are difficult to see and remove and sometimes you change the tube and a few minutes later the new tube is punctured. Some times the only way you find them is to feel the inside of the tire with your fingers. Unfortunately that usually results in sticking myself in the finger and I find the little wire through the blood and pain
Bingo!!! This is exactly what happened to me. When through two tubes. Putting the third one in, I had a novel idea... I inflated the tubes and looked for the leak. I said to myself "Myself, this is odd... the hole is almost in the same place... that means that...."

Grabbed the tire and started slowing feeling the INSIDE of the tire. Sure enough... small piece of wire. I could ride for a day or two and it would abrade and go flat.
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