Tire pressure recommendations

"Warren" wrote in message . com...
"gym gravity" wrote in message
...
Philip W. Moore, Jr. wrote:
Does anybody have links to websites that discuss suggested tire
pressures
for various types of terrain and weather experienced during racing?
I've
typically run my psi at 120 regardless of the terrain or weather out of
habit, but have been told by some seasoned racing vets that I should
lower
the psi to around 100.

I'm more interested in analysis than preference on this one...


http://sheldonbrown.com/brandt/rolling-resistance.html

Please! Jobst is the bozo who told Carl and I that we needn't bother putting
more than 120psi in our track tires. Then Jobst started quoting his outdated
and irrelevant tire studies that do not include any tires made during the
last 3-5 years nor any Continentals.

So, Warren, what difference do you believe there is between "new"
tires and the series that Jobst tested?

For the OP who I presume was asking about road racing, the best pressure
will depend on the road's surface, his weight, cornering ability, length of
race, wet or dry roads, etc.

105-120 psi is a good place to start with about 10 psi less in the front
tire.

The optimal pressure depends on a group of variables. What about rider
weight and tire size? Tractions isn't going to change much regardless
of tire pressure.

Generally the upshot of it is that higher pressure equals lower
rolling resistance, higher incidence of flats and cord failures. Lower
pressure has fewer flats, very slightly higher rolling resistance and
generally better ride.

As it turns out the tire pressures between 95 and 120 are a good
compromise.

"Tom Kunich" wrote in message
om...
"Warren" wrote in message news:0ovkd.19958

So, Warren, what difference do you believe there is between "new"
tires and the series that Jobst tested?

The silica-based tire treads, for one thing. Also, many of the newer tires
have more supple casings than the older tires and casings made of different
materials.


For the OP who I presume was asking about road racing, the best pressure
will depend on the road's surface, his weight, cornering ability, length
of
race, wet or dry roads, etc.

105-120 psi is a good place to start with about 10 psi less in the front
tire.

The optimal pressure depends on a group of variables. What about rider
weight and tire size?

I mentioned "his weight" above.

Tractions isn't going to change much regardless
of tire pressure.

Assuming the rider is good at cornering, cornering is dramatically affected
by tire pressures. 10psi is noticeable to me.

-WG

"Tom Kunich" wrote in message
om...
"Warren" wrote in message news:0ovkd.19958

So, Warren, what difference do you believe there is between "new"
tires and the series that Jobst tested?

The silica-based tire treads, for one thing. Also, many of the newer tires
have more supple casings than the older tires and casings made of different
materials.


For the OP who I presume was asking about road racing, the best pressure
will depend on the road's surface, his weight, cornering ability, length
of
race, wet or dry roads, etc.

105-120 psi is a good place to start with about 10 psi less in the front
tire.

The optimal pressure depends on a group of variables. What about rider
weight and tire size?

I mentioned "his weight" above.

Tractions isn't going to change much regardless
of tire pressure.

Assuming the rider is good at cornering, cornering is dramatically affected
by tire pressures. 10psi is noticeable to me.

-WG