Notice subject heading has transferred to split rims. All your supposed
suggestion to calculating forces are irrelevant. Due to inaccuracies in
tolerance of manufacture, ongoing sample testing is really the only way to
go.
Trevor
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Quoted message said:Chris Neary said:Quoted message said:> I have, and the tire didn't come off. I have a set of Vredestein
> Fortezza Pista tires, which are spec.'ed with a maximum pressure
> of 145 psi. When competing in time trials of up to 40 km, I have
> been known to inflate them to maximum pressure, or maybe a smidgen
> more. I also compete in roller races where I inflate these tires
> to 160 psi. They are mounted on a set of Campagnolo Shamal
> wheels. They have never even given a hit of coming off.Quoted message said:Quoted message said:Rims have blown apart at lower tyre pressures than this. At what
tyre pressure will a rim sustain with what amount of wear? Do rim
manufacturers publish such data? Are they too concerned about
machined surfaces?Quoted message said:FWIW, Mavic specifies maximum recommended pressures for their rims
by tire size. Example:Quoted message said:
http://www.mavic.com/servlet/srt/mavic/road-prod_fiche?product.id=55&lg=uk
Quoted message said:
These numbers seem to arise from tire casing tension which increases
with cross section but is unrelated to blow-off pressure which is
entirely dependent on rim width. A free body diagram of pressure will
reveal that only air pressure, acting at the inside-to-inside width of
the rim, acts on the tire to affect lift-off force. I have no doubt
that casing failures are directly related to tire size (cross section)
but this is not related to lift-off force.Jobst Brandt
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