Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

5 pinch flats??

Old 05-23-13, 07:53 PM
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spectastic
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5 pinch flats??

I was in a group ride today, and we hit a ton of debris. My bike started to feel a little funny, and next thing I know, my front tire was kissing the concrete. Someone asked me if I got what I needed, and I was like "yea". But I was in a hurry today, and had to use my spare tube on my rear wheel right before I left. All I had was 2 patches. When I pulled out the tube and started inflating it to find the leak, it was leaking out as fast as I could put it in. There were at least 5 snake bites across the tube; it was completely shredded. My tire was smooth on the inside. This is bizarre, because before I left home, I pumped the front to ~105 psi (this is a 23mm, and I'm 172 lbs).

The journey back was a heck of a journey too. A guy from the LBS drove by and gave me a spare, but the nipple thingie on that one came out as soon as I yanked the pump head off (I did flip the pump lever)... Another guy riding on the path stopped and gave me a couple of peel patches. But I found out later that even that wasn't enough. I ended up getting a ride from a good samaritan. Bless these people.

But 5? I've had plenty of pinch flats before, but never 5 in a row! I'm not even sure that it is 5. Because I have 4 sealed up right now, and it's still pouring out air like crazy. These tires are getting replaced ASAP. Ridiculous. I'm wondering if this has happened to anyone else.

Last edited by spectastic; 05-23-13 at 07:57 PM.
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Old 05-23-13, 08:12 PM
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You probably had a slow leak when you started. When the air got real low and you were "kissing the concrete," the rim was just cutting into the tube multiple times.

When you pull the "nipple thingie" off, you usually can twist and tighten them back in.
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Old 05-23-13, 08:12 PM
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I'd think that it would only be possible to get one pinch flat at a time, since the "pinch" requires air pressure. I've had one pinch flat and the air went out in a couple of seconds. Perhaps there was a foreign object in your tire?
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Old 05-23-13, 08:19 PM
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I checked the tire. Nothing. And we're talking about 5 snake bites across the whole wheel. I agree with Stan, the tube got cut up by the rim. But the thing is when I left, I always check the tire pressure. The rear was flat, and I took care of that. Then I pumped the front up to 105. Even mid way through the ride, my tire was fine. It was after those debris, and huge bump when my front tire went flat. I think there was a piece of rock or something, that hit my front wheel dead on. It almost shook my hands off the hoods. I bet that was it.
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Old 05-23-13, 08:22 PM
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Originally Posted by ahsposo View Post
You need to check for tiny wire or thorns.

Take a cotton ball and wipe the inside of the tire with it and see if you get a snag.

Check your rim tape for coverage, too.
I check those thing every time I get a flat. The rim tape is smooth, and the tire doesn't have any staple thingies. I run my finger through it at least twice. Upon closer inspection, the tire is pretty beat up. I was crossing the border to LA the other day, and those roads were the crappiest I've ever seen (for an interstate anyway). When I got back, my tires had some bad cuts.
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Old 05-23-13, 08:34 PM
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You sure they aren't from exposed spoke holes (ie - how's the rim tape?)?
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Old 05-23-13, 08:36 PM
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Originally Posted by CrankAndYank View Post
You sure they aren't from exposed spoke holes (ie - how's the rim tape?)?
si!
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Old 05-23-13, 08:40 PM
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105 PSI?

You need to put some wind in your wheels!

I run mine at 120 and have never had a pinch flat. Also - I agree that this is a likely cause:

Originally Posted by StanSeven View Post
You probably had a slow leak when you started...
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Old 05-23-13, 08:46 PM
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Originally Posted by DGlenday View Post
105 PSI?

You need to put some wind in your wheels!

I run mine at 120 and have never had a pinch flat. Also - I agree that this is a likely cause:
He's 172 lbs. 105 psi should be plenty. I'm 170, run 90 psi and never have snake bites.
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Old 05-23-13, 08:46 PM
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OP: Which brand of tire?
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Old 05-23-13, 08:47 PM
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yea... I'm going to start pumping my tires up from now on. It's counter intuitive to think that higher pressure is actually safer, isn't it?

my tires are michilin pro. They came stock with the bike (BD bike). They're 15 bucks on Amazon.
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Old 05-24-13, 12:11 AM
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purely anecdotal, but if you;re running michelin tubes...
I bought a bunch of michelin tubes about 2 yrs ago... each one, after being on the bike for about 10 rides each, split numerous times along the mold seams - looked like pinch flats, but were just split butyl. Each One!
I'd patch them,and within a ride or two, I'd get another flat from splitting somewhere else on the tube... I actually tried to create my own 'split' and with not much pulling the tube across the section, I had the tube splitting at a mold seam... absolute **** butyl !
Michelin tubes, like Hutch tires, are on my 'Haz-Mat' list and will never be purchased again...
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Old 05-24-13, 04:35 AM
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Originally Posted by Big Lebowski View Post
I'd think that it would only be possible to get one pinch flat at a time, since the "pinch" requires air pressure. I've had one pinch flat and the air went out in a couple of seconds. Perhaps there was a foreign object in your tire?
Not if your tube sticks to your tire. As you bring the bike to a stop the wheel rotates a few time rolling over the tire creating multiple pinch flats. I've seen this on more than one occasion where a tire going down caused a pinch flats.
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