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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 07-26-05, 06:51 PM   #1
hansonbp
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pinch flat?

I just got a Trek 4300 a couple weeks ago, and earlier today I noticed my rear tire was flat as I was walking into my office building. It was fine all the way to work, but I did jump a curb on the way. Could this cause a pinch flat? or is the tire popped completely in some way? I'm also not sure if the tires are tubless or not. They are Bontrager ACX 52/54 26" x 2.2" tires. I'm pretty new at this, and never fixed a flat before. Should I just go fill the tire up and see what happens?
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Old 07-26-05, 06:58 PM   #2
sydney
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Should I just go fill the tire up and see what happens?
Ya could, but why waste good air.It will just go flat again. Flats happen for alot of reasons. Too low pressure and pinch flats is one of them. Rough spots on rims or cheap rim strips are also curplits.Road trash and thorns cause lots more.Take your pick.
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Old 07-26-05, 07:02 PM   #3
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The tires on a Trek 4300 will not be tubeless. It is simple to change a tube and you will get better at it with practice.

Take a look at Park Tool's complete guide to changing a tube: http://parktool.com/repair_help/FAQtires.shtml

You probably just have a miniature hole in the tube that leaked slowly, thus you didn't notice it during the ride. Head out to your local bike shop and get a new Schrader tube or a patch kit if you feel daring enough to find the hole and patch it yourself.
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Old 07-26-05, 07:54 PM   #4
hansonbp
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Thanks for the help. Doesn't seem like changing out a tube is difficult. I guess I didn't realize jumping a curb could give you a flat.
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Old 07-26-05, 07:59 PM   #5
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T Doesn't seem like changing out a tube is difficult. I guess I didn't realize jumping a curb could give you a flat.
A good patch is alot cheaper and permanent if done right. And a good chance the curb wasn't the curplit.
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Old 07-26-05, 09:43 PM   #6
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Any hard impact, especially with a sharp edge (like curbs and potholes) can cause pinch or "snakebite" flats.

When you pull the tube out, you may find two small parallel holes in it, the result of being "pinched" against the rim. The cure is to keep your tires inflated properly, and try to avoid hitting things squarely. No reason you can't do those little woods-riding bunny-hops and wheelies on the street.
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