25mm tire recommendations?

Tom Nakashima wrote:
"Paul Kopit" wrote in message
...
On Mon, 9 Jan 2006 02:32:09 +0000 (UTC), Hoi Polloi
wrote:

I usually run mine between 100-120 psi depending on the road conditions.
So
my question should be: For the same value of air pressure, is there a
significant difference in ride quality between the 2 tire sizes?

Not that I can detect when riding. As suggested, lowering the air
pressure is most significant.

Not a significant difference, as I ride both Avocet Fasgrip Road 700 x 25
during workouts and switch to the Avocet Fasgrip Criterium 700 x 23 for fast
pace riding. The 25's give a little more cusion (smoother) on the road and a
bit heavier. I'm using 100psi front and 110psi for the rear.
-tom

Just curious, how much do you weigh? Do you use the same pressure for
both sizes?

Joseph

wrote in
oups.com:


I just had a look at the Dogma FP upstairs. No measuring caliper or
anything, it has Vittoria Evo Ks on Dura Ace wheels, which are
reasoably wide. I have previously measured Vittoria KS on another

In my experience, Vittoria's tend to be accurate or on the narrow side.
Just IMO though.

similar im and gotten 23mm. So I'm pretty sure these are 23. There is
plenty of room for 23mm actual, but not 25mm actual, that would be too
close. The Dogma FP has particularly beefy chainstays.

Rim width will have some effect, but I suspect it is limited. For
example my 25 Michelin's were mounted on very narrow rims and still

He's running a pair of Rolf Vigor's.

were 27+. Michelin seems to have large variation. Maybe different
factories, batches, or who knows.

I think your friend has some extra wide 23's somehow.

Or perhaps he has a lower 'margin of error'. What's an acceptable clearance
btw? 2mm? 3mm?

--

Hoi Polloi

On Tue, 10 Jan 2006 14:43:07 +1100, Bruce Graham
wrote:
It depends on the rim width. I have an old pair of Michelin 23 trainers
on my bike just now. Front on a narrower rim is 22.5mm, rear on a rim
about 4mm wider is 24.3 mm.

Jeff Starr wrote:
I think the size of the tube can have an effect on tire width, too.

No, it surely cannot.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

FWIW, I have found that the newer, all black Avocet 25s seem more
susceptible to nicks and cuts than the old ones. Regards, Roy Zipris

On Wed, 11 Jan 2006 00:11:47 -0600, A Muzi
wrote:

On Tue, 10 Jan 2006 14:43:07 +1100, Bruce Graham
wrote:
It depends on the rim width. I have an old pair of Michelin 23 trainers
on my bike just now. Front on a narrower rim is 22.5mm, rear on a rim
about 4mm wider is 24.3 mm.

Jeff Starr wrote:
I think the size of the tube can have an effect on tire width, too.

No, it surely cannot.

Hi, I got that idea when I used a Vittoria tube that was sized
700x19/23 on the front and a Conti 700x18/25 for the rear. The tires
were Conti Ultra Gatorskins 700x25, bought at the same time. Rims are
velocity Aerohead and Aerohead OC. The front was a millimeter narrower
than the back, at the same pressure.

Yesterday, I checked them again, same one millimeter difference, but I
had changed the front tube to a Conti, same as the rear. So obviously
my assumption was wrong.

Either the tires are different or the wheels with the back being OC
are different. I just looked at Velocity's website, both are claimed
to be 20mm. The only other difference is that the front is 28 hole,
back 32 hole. Wheels were built by Peter at Vecchios, on DA 7700 hubs.

One millimeter, it really doesn't matter.

Jeffrey Starr
All rights to the above text is reserved. No use
outside of rec.bicycle.tech, without express written
permission.

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Tom Nakashima wrote:
"Paul Kopit" wrote in message
...
On Mon, 9 Jan 2006 02:32:09 +0000 (UTC), Hoi Polloi
wrote:

I usually run mine between 100-120 psi depending on the road
conditions.
So
my question should be: For the same value of air pressure, is there a
significant difference in ride quality between the 2 tire sizes?

Not that I can detect when riding. As suggested, lowering the air
pressure is most significant.

Not a significant difference, as I ride both Avocet Fasgrip Road 700 x 25
during workouts and switch to the Avocet Fasgrip Criterium 700 x 23 for
fast
pace riding. The 25's give a little more cusion (smoother) on the road
and a
bit heavier. I'm using 100psi front and 110psi for the rear.
-tom

Just curious, how much do you weigh? Do you use the same pressure for
both sizes?

Joseph


My ideal cycling weight is 145 lbs in July. I go as high as 152 lbs in the
Winter. I'm 5'8" tall.
The tire pressure I use is 100 psi front and 110 psi rear on both the Avocet
Fasgrip Criterium and the Road. When not training or leisure riding, I drop
the pressure to 90 psi front and 100 psi rear using the Avocet Road 700 x
25.
http://home.comcast.net/~tomnak/Tom_...raut05_019.jpg
http://home.comcast.net/~tomnak/Tom_...raut05_005.jpg
-tom

Roy Zipris wrote:
FWIW, I have found that the newer, all black Avocet 25s seem more
susceptible to nicks and cuts than the old ones. Regards, Roy Zipris

After reading the many recommendations for Avocets on this board, I
bought a pair of all black 700 x 25s from Harris cyclery two summers
ago. I had more flat tires on the Avocets in the first 3 months than
in the previous 3 years of riding Conti Ultra 2000s. I am now happily
back on the Ultra 2000s.

BTW, I never got a pinch flat on the Avocets. It was almost always
nicks and holes in the center of the tires. I got really good at
improvising boots with the Avocets.