160 psi

Jim Flom said:

Am I really faster, or do I just feel faster?

The answer is obv----KABOOM!!!!!!!!!!!!

Jim Flom said:

Am I really faster, or do I just feel faster?

ur fast than me - I'm just sitting in a chair.

still me said:

Jim Flom said:

Am I really faster, or do I just feel faster?

ur fast than me - I'm just sitting in a chair.

Is not sitting in a chair how one rides a bicycle? 😉

--
Tom Sherman - Holstein-Friesland Bovinia
When did ignorance of biology become a "family value"?

Tom Sherman said:

still me said:

Jim Flom said:

Am I really faster, or do I just feel faster?

ur fast than me - I'm just sitting in a chair.

Is not sitting in a chair how one rides a bicycle? 😉

If you ever stop posting here, I think I can replace you with a script.

Jim Flom said:

Am I really faster, or do I just feel faster?

Yes.

--

John ([email hidden])

<[email hidden]> wrote...

Quoted message said:

Dear Jim,

You can get a rough idea of just how marginal the difference is with
this calculator:

http://austinimage.com/bp/velocityN/velocity.html

Judging by the trend in Jobst's roller-drum tests, you'd be lucky to
reduce the rolling-resistance drag 10% by increasing inflation from
120 to 160 psi.

The calculator lets you reduce the 0.0050 rolling resistance 10% (or
anything you like) to 0.0045 and compare the details side-by-side.

For the defaults, that raises speed for 300 watts from 37.178 to
37.400 km/h, a rather marginal 0.222 km/h, and improves the time for
10 km from 16.138 to 16.042 minutes--a little less than 6 seconds.

For comparison, it's the same effect as a 0.35 km/h tailwind.

Cheers,

Carl Fogel

Mind you, I'm not just doing it for fun. 160 is the prescribed psi for the
new tires my LBS sold me. I asked for Continentals (120 psi) but he
suggested (had in stock?) Vredesteins Fortezza SEs, which are I guess one
rung down from the one's he rides on (not that he's terribly strong).

Thanks Carl.

Jim

Jim Flom said:

Mind you, I'm not just doing it for fun. 160 is the prescribed psi for the
new tires my LBS sold me. I asked for Continentals (120 psi) but he
suggested (had in stock?) Vredesteins Fortezza SEs, which are I guess one
rung down from the one's he rides on (not that he's terribly strong).

Oh. You *definitely* do not have to run the sidewall pressures of a
tire. My 28 mm tires recommend 115 psi with a max of 125 psi. I'm a
light guy, so at 90 psi they feel quite harsh. And pretty comfortable
at about 75 psi.

\\paul

In article <%kbVi.45894$G25.35822@edtnps89>,

Jim Flom said:

<[email hidden]> wrote...

Quoted message said:

Dear Jim,

You can get a rough idea of just how marginal the difference is with
this calculator:

http://austinimage.com/bp/velocityN/velocity.html

Judging by the trend in Jobst's roller-drum tests, you'd be lucky to
reduce the rolling-resistance drag 10% by increasing inflation from
120 to 160 psi.

The calculator lets you reduce the 0.0050 rolling resistance 10% (or
anything you like) to 0.0045 and compare the details side-by-side.

For the defaults, that raises speed for 300 watts from 37.178 to
37.400 km/h, a rather marginal 0.222 km/h, and improves the time for
10 km from 16.138 to 16.042 minutes--a little less than 6 seconds.

For comparison, it's the same effect as a 0.35 km/h tailwind.

Cheers,

Carl Fogel

Mind you, I'm not just doing it for fun. 160 is the prescribed psi for the
new tires my LBS sold me. I asked for Continentals (120 psi) but he
suggested (had in stock?) Vredesteins Fortezza SEs, which are I guess one
rung down from the one's he rides on (not that he's terribly strong).

Thanks Carl.

Jim

Jim you poser! Run 'em at 120, unless you're at the velodrome.

-RjC.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"My scenarios may give the impression I could be an excellent crook.
Not true - I am a talented lawyer." - Sandy in rec.bicycles.racing

"Ryan Cousineau" <[email hidden]> wrote...

Quoted message said:

Jim you poser! Run 'em at 120, unless you're at the velodrome.

Dude, stick to your 'tub. How'd that go, anyway?

In article <A_bVi.45896$G25.36929@edtnps89>,

Jim Flom said:

"Ryan Cousineau" <[email hidden]> wrote...

Quoted message said:

Jim you poser! Run 'em at 120, unless you're at the velodrome.

Dude, stick to your 'tub. How'd that go, anyway?

Not yet. Next weekend. It's ordered though, so there's no backing out
now. You should totally drop by just to watch:

http://www.escapevelocity.bc.ca/crossquitlam

But speaking of CX, this weekend was a doubleheader. Hardly messy at all
on Saturday in Surrey, followed by very, very messy in Maple Ridge on
Sunday.

Hilariously messy! My race was punctuated by a huge fall-down on this
bizarre, mucky little off-camber hump of a corner about 100m from the
start. It worked out great for me, because I used my freaky-looking
running start to shoot from the back of the start grid up to about fifth
wheel at the corner. That wasn't close enough to be ahead of the
accident, but it was close enough to be able to ride around the accident
without stopping. Well, a little dab.

That meant I went into the next corner in an unprecedented 6th place, at
which point I tormented an unusually large selection of riders by,
despite numerous attempts by the ground to change things up, not falling
down. Well, a few dabs.

Of course, most of them passed me regardless. But it was hard work! I
got passed by one of the Cat 2s on my club (very powerful on the road,
hilariously unskilled in CX) only on the last lap. If I had known it was
him, I would have put him in the weeds (Hi, Axel!).

The course was so sloppy that eventually riding around corners with the
rear wheel in powerslide-oversteer on corner exit stopped being a
mistake, and started being a technique. I just routinely ran it into
corners where the front wheel would simply not control the direction of
travel for a few seconds.

ObTech: A few weeks ago I mentioned the discovery of fine, dry dirt
inside of my tire casing after a race. After this race, I discovered the
same phenomenon, only (urgh) inside my bike shorts.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"My scenarios may give the impression I could be an excellent crook.
Not true - I am a talented lawyer." - Sandy in rec.bicycles.racing

Ryan Cousineau said:

ObTech: A few weeks ago I mentioned the discovery of fine, dry dirt
inside of my tire casing after a race. After this race, I discovered the
same phenomenon, only (urgh) inside my bike shorts.

I went riding through some absolutely fabulous mud puddles at a
mountain bike race two weeks ago. Come the inevitable time to crash
and I got road rash on the inside of my thigh. There was no question
of riding at all for most of the next week.

-M

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

Quoted message said:

Ryan Cousineau said:

ObTech: A few weeks ago I mentioned the discovery of fine, dry dirt
inside of my tire casing after a race. After this race, I discovered the
same phenomenon, only (urgh) inside my bike shorts.

I went riding through some absolutely fabulous mud puddles at a
mountain bike race two weeks ago. Come the inevitable time to crash
and I got road rash on the inside of my thigh. There was no question
of riding at all for most of the next week.

I have had road-rash on my back, stomach, shoulders, arms, buttocks, outer thighs, and calves at various times in the
past. But the mind boggles when I try to imagine how you could land in order to get inner-thigh road-rash!!!

Mike

Quoted message said:

Quoted message said:

"Ryan Cousineau" <[email hidden]> wrote...

Quoted message said:

Jim you poser! Run 'em at 120, unless you're at the velodrome.

Quoted message said:

Jim Flom said:

Dude, stick to your 'tub. How'd that go, anyway?

Ryan Cousineau said:

Not yet. Next weekend. It's ordered though, so there's no backing out
now. You should totally drop by just to watch:

http://www.escapevelocity.bc.ca/crossquitlam

But speaking of CX, this weekend was a doubleheader. Hardly messy at all
on Saturday in Surrey, followed by very, very messy in Maple Ridge on
Sunday.

Hilariously messy! My race was punctuated by a huge fall-down on this
bizarre, mucky little off-camber hump of a corner about 100m from the
start. It worked out great for me, because I used my freaky-looking
running start to shoot from the back of the start grid up to about fifth
wheel at the corner. That wasn't close enough to be ahead of the
accident, but it was close enough to be able to ride around the accident
without stopping. Well, a little dab.

That meant I went into the next corner in an unprecedented 6th place, at
which point I tormented an unusually large selection of riders by,
despite numerous attempts by the ground to change things up, not falling
down. Well, a few dabs.

Of course, most of them passed me regardless. But it was hard work! I
got passed by one of the Cat 2s on my club (very powerful on the road,
hilariously unskilled in CX) only on the last lap. If I had known it was
him, I would have put him in the weeds (Hi, Axel!).

The course was so sloppy that eventually riding around corners with the
rear wheel in powerslide-oversteer on corner exit stopped being a
mistake, and started being a technique. I just routinely ran it into
corners where the front wheel would simply not control the direction of
travel for a few seconds.

ObTech: A few weeks ago I mentioned the discovery of fine, dry dirt
inside of my tire casing after a race. After this race, I discovered the
same phenomenon, only (urgh) inside my bike shorts.

"mucky little off-camber hump "
I think r.b.t. has a concurrent thread about that. Or a bike like it.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

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

Quoted message said:

In article <A_bVi.45896$G25.36929@edtnps89>,

Jim Flom said:

"Ryan Cousineau" <[email hidden]> wrote...

Quoted message said:

Jim you poser! Run 'em at 120, unless you're at the velodrome.

Dude, stick to your 'tub. How'd that go, anyway?

Not yet. Next weekend. It's ordered though, so there's no backing out
now. You should totally drop by just to watch:

I'm actually planning to be in Vancouver Friday night to crack of dawn
Sunday. we should meet in real life. Let's work this out on Facebook, if
you don't mind being interrupted in your musings about your hilariously
muddy weekend (which, evidently you don't).

In article <[email hidden]>,

A Muzi said:

Quoted message said:

Quoted message said:

"Ryan Cousineau" <[email hidden]> wrote...
> Jim you poser! Run 'em at 120, unless you're at the velodrome.

Quoted message said:

Jim Flom said:

Dude, stick to your 'tub. How'd that go, anyway?

Ryan Cousineau said:

Not yet. Next weekend. It's ordered though, so there's no backing out
now. You should totally drop by just to watch:

http://www.escapevelocity.bc.ca/crossquitlam

But speaking of CX, this weekend was a doubleheader. Hardly messy at all
on Saturday in Surrey, followed by very, very messy in Maple Ridge on
Sunday.

Hilariously messy! My race was punctuated by a huge fall-down on this
bizarre, mucky little off-camber hump of a corner about 100m from the
start. It worked out great for me, because I used my freaky-looking
running start to shoot from the back of the start grid up to about fifth
wheel at the corner. That wasn't close enough to be ahead of the
accident, but it was close enough to be able to ride around the accident
without stopping. Well, a little dab.

Quoted message said:

"mucky little off-camber hump "
I think r.b.t. has a concurrent thread about that. Or a bike like it.

This was more of a...group thing...

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"My scenarios may give the impression I could be an excellent crook.
Not true - I am a talented lawyer." - Sandy in rec.bicycles.racing