tire air pressure

On 14 Jun 2004 02:30:20 -0700, [email hidden] (billy d.)

Quoted message said:

what should my tire air pressure be at for a trek
road bike?

How much do you weight, and what does it say on the
sidewalls of your tires?

Barry

In article
<[email hidden]>,
tungsteneer3 @yahoo.com says...

Quoted message said:

what should my tire air pressure be at for a trek
road bike?

Makes no difference if it's a trek or whatever, go read what
it says about max pressure on the tire.

--
"There's a fine line between an attitude problem and
thinking clearly."
d.B. ICQ: 138579247

On 14 Jun 2004 02:30:20 -0700, [email hidden] (billy d.)

Quoted message said:

what should my tire air pressure be at for a trek road bike

What does the side wall say? With good tires and rims you
can exceed the sidewall rating somewhat.

I use to run 115psi on my road bike.

"billy d." <[email hidden]> schreef in bericht
"]news:[email hidden]...

Quoted message said:

what should my tire air pressure be at for a trek
road bike?

depending on what it says in de side on the tire

e.g. my off road Racing Ralph from Schwalbe say: inflate
between 2,0 and 4,0 atm. depending on the status of the
tracks I will be riding I make a choice:

dunes or beach: 1,8 - 2,0 (front - rear) loose sand in
fores: 3,0 - 3,5 hard rock: 3,0 - 3,5

the race bikes Schwalbe Stelvio's can take air pressures up
to 10 atm. I inflate them with 7.0 - 8.0 on cobble stones
and increase to 8.0 - 9.0 for time trial like events.

bert

--
Posted by news://news.nb.nu

Bonehenge wrote:
:: On 14 Jun 2004 02:30:20 -0700, [email hidden]
:: (billy d.) wrote:
::
::: what should my tire air pressure be at for a trek
::: road bike?
::
:: How much do you weight, and what does it say on the
:: sidewalls of your tires?
::
:: Barry

How does rider weight factor into tire inflation?

Roger Zoul said:

How does rider weight factor into tire inflation?

Heavier riders can get better performance and avoid pinch
flats by exceeding the printed maximum inflation. Very
light riders can get better handling by slightly under
inflating tires.

Did you ever notice that tire inflation pressures are often
provided as a range, not a single pressure?

I'm a bigger rider (235 lbs.), and have found that my
Michelins ride the best for me at about 125 psi. The
sidewall maximum is 115 psi. I've ridden with very light
women who have found that maximum inflation can cause their
tires to feel skitterish during hard cornering.

Barry

Roger Zoul said:

Bonehenge wrote:
:: On 14 Jun 2004 02:30:20 -0700, [email hidden]
:: (billy d.) wrote:
::
::: what should my tire air pressure be at for a trek road
::: bike?
::
:: How much do you weight, and what does it say on the
:: sidewalls of your tires?
::
:: Barry

How does rider weight factor into tire inflation?

I believe the same principle applies here that applies to
motor vehicles/rvs...I run different pressures based on the
load and this is in accordance with the tables from tire
manufacturers. Look at the label on your vehicle door
jamb...pressures are specified for specific loads/weights.

When I commuted on my mtn bike (with fat road tires) I ran
around 115 psi even though the tires were labelled for 80. I
weigh 200lbs.

My bike shop also says that given good rims and good tires
the labelled pressure can be safely exceeded, within reason.

It is too bad bike tire manufacturers can't provide the same
type information.

Quoted post said:

Originally posted by Bert L.Am
"billy d." <[email hidden]> schreef in bericht
"]news:[email hidden]...

Quoted message said:

what should my tire air pressure be at for a trek
road bike?

depending on what it says in de side on the tire

e.g. my off road Racing Ralph from Schwalbe say: inflate
between 2,0 and 4,0 atm. depending on the status of the
tracks I will be riding I make a choice:

dunes or beach: 1,8 - 2,0 (front - rear) loose sand in
fores: 3,0 - 3,5 hard rock: 3,0 - 3,5

the race bikes Schwalbe Stelvio's can take air pressures up
to 10 atm. I inflate them with 7.0 - 8.0 on cobble stones
and increase to 8.0 - 9.0 for time trial like events.

bert

--
Posted by news://news.nb.nu

Nicely informative, but I'm going to go out on a limb here and make the assumption that there are a few people who don't know that 1 atmosphere=14.7lb/in.² 😄

Bonehenge wrote:
:: On Mon, 14 Jun 2004 18:57:10 -0400, "Roger Zoul"
:: <[email hidden]> wrote:
::
::
::: How does rider weight factor into tire inflation?
::
:: Heavier riders can get better performance and avoid pinch
:: flats by exceeding the printed maximum inflation. Very
:: light riders can get better handling by slightly under
:: inflating tires.
::
:: Did you ever notice that tire inflation pressures are
:: often provided as a range, not a single pressure?
::
:: I'm a bigger rider (235 lbs.), and have found that my
:: Michelins ride the best for me at about 125 psi. The
:: sidewall maximum is 115 psi. I've ridden with very light
:: women who have found that maximum inflation can cause
:: their tires to feel skitterish during hard cornering.

I weigh 240 lbs so this is good info for me. Thanks.

brian-s-jones-at-comcast.net wrote:
:: On Mon, 14 Jun 2004 18:57:10 -0400, "Roger Zoul"
:: <[email hidden]> wrote:
::
::: Bonehenge wrote:
::::: On 14 Jun 2004 02:30:20 -0700, [email hidden]
::::: (billy d.) wrote:
:::::
:::::: what should my tire air pressure be at for a trek
:::::: road bike?
:::::
::::: How much do you weight, and what does it say on the
::::: sidewalls of your tires?
:::::
::::: Barry
:::
::: How does rider weight factor into tire inflation?
::
::
:: I believe the same principle applies here that applies to
:: motor vehicles/rvs...I run different pressures based on
:: the load and this is in accordance with the tables from
:: tire manufacturers. Look at the label on your vehicle
:: door jamb...pressures are specified for specific
:: loads/weights.
::
:: When I commuted on my mtn bike (with fat road tires) I
:: ran around 115 psi even though the tires were labelled
:: for 80. I weigh 200lbs.
::
:: My bike shop also says that given good rims and good
:: tires the labelled pressure can be safely exceeded,
:: within reason.
::
:: It is too bad bike tire manufacturers can't provide the
:: same type information.

The owner of my LBS told me that the max psi rating on a
tire means that you can inflate it to twice the listed
max before the tire will explode. I don't plan to test
that out 🙂

Thanks for the info...I weigh 240 so this is useful
info for me.

Roger Zoul said:

How does rider weight factor into tire inflation?

Take a look at this chart:

precisiontandems.comtirechart.jpgOpen ↗

Art Harris

Nice to know I'm not the only "plus" sized guy on a bike - I
weigh 280lbs.

Arlie C.

"Roger Zoul" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

brian-s-jones-at-comcast.net wrote:
:: On Mon, 14 Jun 2004 18:57:10 -0400, "Roger Zoul"
:: <[email hidden]> wrote:
::
::: Bonehenge wrote:
::::: On 14 Jun 2004 02:30:20 -0700,
::::: [email hidden] (billy d.) wrote:
:::::
:::::: what should my tire air pressure be at for a trek
:::::: road bike?
:::::
::::: How much do you weight, and what does it say on the
::::: sidewalls of your tires?
:::::
::::: Barry
:::
::: How does rider weight factor into tire inflation?
::
::
:: I believe the same principle applies here that applies
:: to motor vehicles/rvs...I run different pressures based
:: on the load and this is in accordance with the tables
:: from tire manufacturers. Look at the label on your
:: vehicle door jamb...pressures are specified for
:: specific loads/weights.
::
:: When I commuted on my mtn bike (with fat road tires) I
:: ran around 115 psi even though the tires were labelled
:: for 80. I weigh 200lbs.
::
:: My bike shop also says that given good rims and good
:: tires the labelled pressure can be safely exceeded,
:: within reason.
::
:: It is too bad bike tire manufacturers can't provide the
:: same type information.

The owner of my LBS told me that the max psi rating on a
tire means that

you

Quoted message said:

can inflate it to twice the listed max before the tire
will explode. I don't plan to test that out 🙂

Thanks for the info...I weigh 240 so this is useful
info for me.

Harris wrote:
:: Roger Zoul <[email hidden]> wrote:
::
::: How does rider weight factor into tire inflation?
::
:: Take a look at this chart:
::
:: precisiontandems.comtirechOpen ↗
:: art.jpg
::
:: Art Harris

Amazingly, according to this chart, I have might about
right! Stroke of pure luck...

In article <pFFzc.38453$eu.22899@attbi_s02>,
[email hidden] says...

Quoted message said:

Nice to know I'm not the only "plus" sized guy on a bike -
I weigh 280lbs.

Arlie C.

You may not believe it, but there are avid cyclists who post
here who outweigh you by 100lbs.

....

--
Remove the ns_ from if replying by e-mail (but keep posts in
the newsgroups if possible).

Interesting. I am way over inflating. I just hate getting
flats though.

Curt

"Harris" <[email hidden]> wrote in
message "]news:[email hidden]...

Quoted message said:

Roger Zoul said:

How does rider weight factor into tire inflation?

Take a look at this chart:

precisiontandems.comtirechart.jpgOpen ↗

Art Harris

In article <[email hidden]>,
[email hidden] says...

Quoted message said:

Interesting. I am way over inflating. I just hate getting
flats though.

Personally, I think that chart gives somewhat too low of a
value for recommended pressure. It doesn't list their
criteria for what determines the "best" pressure either.

Quoted message said:

Curt

"Harris" <[email hidden]> wrote in
message news:l6Dzc.1356$ri.111249@dfw-
read.news.verio.net...

Quoted message said:

Roger Zoul said:

How does rider weight factor into tire inflation?

Take a look at this chart:

precisiontandems.comtirechaOpen ↗
rt.jpg

Art Harris

--
Remove the ns_ from if replying by e-mail (but keep posts in
the newsgroups if possible).

David Kerber ns_dkerber@ns_ids.net said:

Quoted message said:

Interesting. I am way over inflating. I just hate getting
flats though.

Quoted message said:

Personally, I think that chart gives somewhat too low of a
value for recommended pressure. It doesn't list their
criteria for what determines the "best" pressure either.

I'd have to agree with this. Together with the bike and
other gear I weigh about 155 lbs, and I've run my 23 mm
tyres at pressures between 105 and 120 psi with no real
discomfort. According to the graph, the "ideal" inflation
for me would be 80 psi, which seems ridiculous.

I guess I could get away with just 80 psi without getting
too many pinch flats (I get none now), so perhaps the graph
can be helpful in determining the lowest safe pressure. But
especially for lighter riders, there's usually no reason not
to go higher than that.

-as

"Antti Salonen" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

David Kerber ns_dkerber@ns_ids.net said:

Quoted message said:

Interesting. I am way over inflating. I just hate
getting flats

though.

Quoted message said:

Quoted message said:

Personally, I think that chart gives somewhat too low of
a value for recommended pressure. It doesn't list their
criteria for what determines the "best" pressure either.

I'd have to agree with this. Together with the bike and
other gear I weigh about 155 lbs, and I've run my 23 mm
tyres at pressures between 105 and 120 psi with no real
discomfort. According to the graph, the "ideal" inflation
for me would be 80 psi, which seems ridiculous.

I guess I could get away with just 80 psi without getting
too many pinch flats (I get none now), so perhaps the
graph can be helpful in determining the lowest safe
pressure. But especially for lighter riders, there's
usually no reason not to go higher than that.

-as

I weigh about 180, so there might be a concern, but I prefer
the feel of my tires at a high pressure. I am riding on
25's, which is a pretty big tire. I think I will keep them
up at 120ish as I have had no problems and seem to like the
lower resistance.

Curt

Antti Salonen said:

Together with the bike and other gear I weigh about 155
lbs, and I've run my 23 mm tyres at pressures between 105
and 120 psi with no real discomfort. According to the
graph, the "ideal" inflation for me would be 80 psi, which
seems ridiculous.

Many 200 lb riders (~222 lb rider plus bike) ride 23 mm
tires at 120 psi. Don't you think that you (being much
lighter) should run significantly less pressure? I know it
may "seem" ridiculous since most of us tend to air up the
max pressure printed on the tire. But it really should be
related to the load.

Quoted message said:

I guess I could get away with just 80 psi without getting
too many pinch flats (I get none now), so perhaps the
graph can be helpful in determining the lowest safe
pressure. But especially for lighter riders, there's
usually no reason not to go higher than that.

Less pressure will give better traction and a more
comfortable ride. That could be especially important in rain
or on dirt roads

The chart appears to be from Bicycling Magazine, but the
website that hosts it is tandem related. It works out about
right for me: 225 lbs (rider+bike+gear) and 700x25 tires.
According to the chart, I should run 100 psi. I usually run
about 105 psi. I get good tire life and no pinch flats.

But my wife weighs 110lbs and has a 25 lb bike with 1-1/4"
tires. She would be off the chart (less than 50 psi). We
actually run about 75 psi in her tires.

Art Harris