| Re: Rim brake heat and clincher blowoff, was Re: Potential good news for Mt. Washington access.
Tom Sherman writes:
> There still needs to be a control for temperature in the static
> test, since of course compressing air into the tire raises the
> temperature of the air and casing. However, if the tire is inflated
> slowly, actual temperature rise will be insignificant.
> In addition to the motion between the tire and rim that Jobst Brandt
> mentions as possibly affecting blow-off pressure, there is the
> effect of heating the tire, since the rubber will change properties
> with temperature.
I don't believe inflating a tire makes enough temperature difference
to worry about. I have not noticed hot tires from inflation nor even
a hot hose or brass hose-to-valve coupler (hose chuck). I am aware of
Silca frame fit pump heads getting hot in the hand while pumping but
that is a big difference from a floor pump and hose.
I think we are scraping at nits. Besides, who gives a damn how much
pressure a stationary wheel can hold. We are interested in safely
riding down steep grades.
Jobst Brandt
jobst.brandt@stanfordalumni.org
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