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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 07-19-08, 09:28 PM   #1
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Loosing PSI or loosing my mind?

A couple of weeks ago I took a day off to work on my bikes and go for a nice long ride. I wanted to test out the new tall stem that I installed on my Motobecane Nomade, so I top off the tires and load up my stuff and away I go. Not a minute later the bike is feeling squrrely and I look down to see my rear tire seems a bit more flabby than it should. These tires and tubes came with the bike from the original owner but I don't believe their too old. Well the thing is, I topped them off at 90-psi and then when I put the pump on the dial read around 70-psi. So I topped them off again to 90 and not a minute later the bike is squirrely again and the rear tire--which now has more of my weight on it due to the taller stem--seems flabby again. I decide to scrap my ride as I had spent most of my day installing cables and cleaning up my frankenbike. I pump up and ride home and by the time I'm home again everything seems flabby. I'm thinking 'great, got a slow pinch flat right away on my dirt/gravel road'. Fast-forward 2 weeks and I look at the tires and they still have air in them??? *scratches head* I expected this to be flat like my PUCH. Can a tube get old and decide not to hold 90-psi anymore???
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Old 07-19-08, 09:34 PM   #2
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Have you submerged the tube in water looking for leaks? Maybe there is a small hole in the tube that doesn't leak much air until you put alot of pressure on it?
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Old 07-19-08, 09:35 PM   #3
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Valve stem loose?
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Old 07-19-08, 09:50 PM   #4
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Check for a leak. Take the tube out, put some air into it, and plunge it under water and rotate it through looking for a stream of bubbles. Sounds like you have a slow leak.

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Old 07-19-08, 10:52 PM   #5
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Once upon a time, I had a tire go absolutely totally flat overnight, after topping it up and riding about 10 miles. Pumped the tire up, and it never had a problem again. My guess is that there was a tiny bit of dirt in the valve.
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Old 07-19-08, 11:12 PM   #6
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