Tire Pressure (Page 2)

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2009-07-11 5:25 PM
in reply to: #2274225

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Subject: RE: Tire Pressure
gsmacleod - 2009-07-09 3:45 PM It is likely that you have a small object embedded in your tire or you have bad rim tape.  If your are flatting then there is definitely a hold in your tube so the next time (or if you still have one of your flats) inflate it until you find the leak.  If it is a slow leak, some soapy water can be your best friend in finding the leak.

As for the pressure, even if we take an extreme example, according to the ideal gas law (PV=nRT) where T is measure in Kelvin, a change of 50K (90F) is about 7.25psi difference so unless you are blowing the bead off the rim (unlikely unless you are running above the max recommended psi) then it is not likely the pressure that is causing your flats.

Shane


Using equations to back up a theory? I love it! (Mechanical Engineering is my day job...)

Having said that though, I wouldn't completely rule out the heat as a cause for the tire bursting. With the 100+ degree heat we see here in Oklahoma, I have seen tubes bust from simply sitting out in the sun all day when they were inflated to their max pressure (about 110psi i think) that morning. I don't know if the excess heat simply weakens the rubber or what, but it definitely does happen.

2009-07-11 7:57 PM
in reply to: #2274169

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Subject: RE: Tire Pressure
NeilsWheel - 2009-07-09 4:33 PM I weigh about 195.  If I don't fill my tires up to 120 I'll flat out on these little white rocks that TxDot seems to scatter along the shoulders of most roads around where I ride.

I had a tire suddenly lose about 60lbs of pressure while riding.  It didn't have an obvious leak, but when I inflated it and put the tube under water there was a leak where the stem attaches to the tube.  I'm wondering if when I pumped it up I didn't wiggle the stem too much.


I flatted a lot one fall.  I found that if you make sure to center valve on a certain part of the decal on the tire, it will help you find the thorn, glass or stone chip in the tire.  Once you find the hole in the tube you just line the valve up with the decal and it gives you an idea where the puncture is in the tire.  that give you the chance to dig out the offending object out of the tire 
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