The difference 1 Bar makes!!!

Mark A Poman said:

Been running my new Vittoria 700x23 Open Corsa CX Tires
the last couple of weeks at 7 Bar (100psi) I thought these
seemed hard (Ridewise), but decided for the heck of it, to
up the poundage to 8 Bar (115psi) Man, what a difference!

OK. I'll bite. What is the difference and what is the
benefit?

Quoted message said:

While most of my roads are on the horrible side around
here anyway, and I was worried about a much harder ride, I
didn't really notice too much difference in ride quality,
but I sure did notice a difference as far as rolling
resistance was concerned. It certainly seemed to take less
effort to pedal, and keep a good pace with the higher
inflation pressures.

Are you sure you weren't experiencing a psychosomatic
response? If you look at RR graphs at:

terrymorse.comrolres.gifOpen ↗

You'll see that differences in RR are minuscule at those
pressures.

Quoted message said:

I don't think I'll be going back to a lower setting! May
try 120psi next just for the heck of it?

I think you are also overlooking cornering, for which the
contact patch has become smaller and compliance of the tire
to road texture has become worse.

Jobst Brandt [email hidden]

Hello Jobst, Thank you for your reply.

Honestly, there was a slight difference I could feel, and
seemed that acceleration/coming up to cruising speed was
also a bit easier with the higher (8 Bar )pressures.

Maybe you are right in a sense about imagining this quality,
as every time I ride, I see to be improving all the time, so
perhaps each time I ride, I am becoming stronger, and
stronger, and this makes it feel like it's easier to pedal?
lol This might be a more real explanation?, I don't know?

Since recommended inflation pressures are 7-9 Bar for this
tire, I figured why am I running at the low end, and wanted
to try a bit more pressure.

Will Tire adhesion be necessarily worse increasing
pressure by 1 Bar with this particular tire? Thank you
again Jobst, Mark D.

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Quoted message said:

Mark A Poman said:

Been running my new Vittoria 700x23 Open Corsa CX Tires
the last couple of weeks at 7 Bar (100psi) I thought
these seemed hard (Ridewise), but decided for the heck
of it, to up the poundage to 8 Bar (115psi) Man, what a
difference!

OK. I'll bite. What is the difference and what is the
benefit?

Quoted message said:

While most of my roads are on the horrible side around
here anyway, and I was worried about a much harder ride,
I didn't really notice too much difference in ride
quality, but I sure did notice a difference as far as
rolling resistance was concerned. It certainly seemed to
take less effort to pedal, and keep a good pace with the
higher inflation pressures.

Are you sure you weren't experiencing a psychosomatic
response? If you look at RR graphs at:

terrymorse.comrolres.gifOpen ↗

You'll see that differences in RR are minuscule at those
pressures.

Quoted message said:

I don't think I'll be going back to a lower setting! May
try 120psi next just for the heck of it?

I think you are also overlooking cornering, for which the
contact patch has become smaller and compliance of the
tire to road texture has become worse.

Jobst Brandt [email hidden]

Mark D Poman said:

Since recommended inflation pressures are 7-9 Bar for this
tire, I figured why am I running at the low end, and
wanted to try a bit more pressure.

Quoted message said:

Will Tire adhesion be necessarily worse increasing
pressure by 1 Bar with this particular tire?

Unless you are one to corner, leaned over more than 40
degrees, I don't think you'll find any change. 23mm tires
aren't any good for cornering anyway. They are too narrow to
bridge bad traction spots and too hard to have a
sufficiently large contact patch.

Jobst Brandt [email hidden]

Jobst, Just thinking some more about this, I was
experiencing a pressure gauge problem over the past couple
weeks, and this may also have influenced a possible
erroneous reading previously?

I have not have been a 7 Bar before, and so, there may be
the possibility that I have gone to an increase greater
than 1 Bar?

Just rode 20mi earlier with the tires at 120psi, and they
performed just fine.

Mark

[email hidden] (Mark) wrote in message
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Quoted message said:

Been running my new Vittoria 700x23 Open Corsa CX Tires
the last couple of weeks at 7 Bar (100psi) I thought these
seemed hard (Ridewise), but decided for the heck of it, to
up the poundage to 8 Bar (115psi) Man, what a difference!

While most of my roads are on the horrible side around
here anyway, and I was worried about a much harder ride, I
didn't really notice too much difference in ride quality,
but I sure did notice a difference as far as rolling
resistance was concerned. It certainly seemed to take less
effort to pedal, and keep a good pace with the higher
inflation pressures.

I don't think I'll be going back to a lower setting! May
try 120psi next just for the heck of it? Mark

Mark said:

Been running my new Vittoria 700x23 Open Corsa CX Tires
the last couple of weeks at 7 Bar (100psi) I thought these
seemed hard (Ridewise), but decided for the heck of it, to
up the poundage to 8 Bar (115psi) Man, what a difference!

Agreed. I find CX's sluggish at 7 bar. I have the front at
7.5 to 8, and the rear at just over 8.5.

~PB

(Mark) said:

Maybe you are right in a sense about imagining this
quality, as every

BTW, if you're not sure if it's your imagination that the
rolling resistance is better, and it helps you enjoy your
riding more, then who cares whether it's real or imagined?
--
Rick Onanian