I just don't brake! Look out!
On Mon, Mar 31, 2008 at 7:19 PM, John Barry <usazorro@yahoo.com> wrote:
> Mike,
>
> You don't hydroplane on bicycle tires? Maybe you just
> aren't going fast enough. ;)
>
> I see the point about there being a difference between
> auto tires and skinny bicycle tires. I was thinking
> more of what occurs with a 27" x 1-1/4" or a 35mm 700c
> tire though (think borderline cyclocross tires), as
> that's what I frequently ride.
>
> I do notice increased rolling resistance in some
> situations, and tread pattern could seem to
> potentially play some role in diminishing the effect.
>
> Obviously, there's some point at which the weight
> becomes low enough, and the surface area becomes great
> enough that tread pattern becomes a factor. Does
> someone out there on the list know where that point
> is?
>
> Regards,
>
> John Barry
> Mechanicsburg (now cold as well as wet) PA, USA
>
>
> --- mike scammon <mike@scammoncycles.com> wrote:
>
> > On Mon, Mar 31, 2008 at 5:00 PM, John Barry
> > <usazorro@yahoo.com> wrote:
> >
> > > Sounds like another shot-from-the-hip Jobst
> > theory.
> >
> >
> > >
> > > Anyone who has driven on good tires on a wet road,
> > and
> > > then driven on bald ones on a wet road and not
> > noticed
> > > a difference, would have to be either very
> > distracted,
> > > or borderline comatose.
> >
> >
> > Sounds like you're comparing bicycle tires to car
> > tires?
> > Car tires are affected differently due to their
> > rectangular footprint, which
> > reduces their ability to purge water.
> > I have raced for years in wet and dry (not while
> > comatose or distracted).
> > *Any* difference in cornering traction in wet
> > weather (where the tire is
> > the cause) is from the casing deflection or rider
> > skill etc... and *not*
> > from the fact that it was treadless.
> >
> > >
> > >
> > > Hydroplaning is a very real phenomenon,
> >
> >
> > t's not really a phenomenon. It's more basic
> > physics and again, your
> > comparing a car vs a bicycle.
> > The round shape of the bicycle tire prevents hydro
> > planing much better than
> > a car would.
> > that should be pretty simple to understand.
> >
> > and to suggest that tread pattern could not have
> > some bearing on how
> > > severely hydroplaning affected a tire just doesn't
> > have their facts
> > > straight.
> >
> >
> > It does have bearing. Just the kind you don't want
> > from a road tire.
> > Please tell me how having treaded road tires helps
> > you fend off
> > hydro-planing? Or aids in cornering?
> > This argument is old and has been disproven many
> > times over.
> >
> >
> >
> >
> > > I'll leave the posting of
> > > citations on the topic to the engineers here.
> > >
> > > John Barry
> > > Mechanicsburg (where bald tires wouldn't be a good
> > > idea tonight), PA, USA
> > >
> > >
> > >
> > > >
> > > > Anyway, here's Jobst on the subject (found on
> > line).
> > > >
> > > > *snip from Jobst*
> > > >
> > > > * Tread patterns have no effect on surfaces in
> > which
> > > > they leave no
> > > > impression. That is to say, if the road is
> > harder
> > > > than the tire, a tread
> > > > pattern does not improve traction. That smooth
> > tires
> > > > have better dry
> > > > traction is probably accepted by most
> > bicyclists,
> > > > but wet pavement still
> > > > appears to raise doubts even though motorcycles
> > have
> > > > shown that tread
> > > > patterns do not improve wet traction.*
> > > >
> > > > */snip Jobst*
> > >
> > >
> > >
> > >
> > >
> >
>
> ____________________________________________________________________________________
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> > >
> >
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> > >
> >
> >
> >
> > --
> > Mike Scammon
> > Menlo Park, Ca.
> >
>
>
>
>
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-- Mike Scammon Menlo Park, Ca.
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