27 inch race tire?

Trailgalore said:

Who makes a 27 inch race tire?

Nobody now, but when Avocet discontinued theirs, we bought all they had.

We still have a good stock of the model 20 and 30 27 x 7/8, the fastest
27" tire ever made.

See: http://harriscyclery.com/630

Sheldon "27" Brown
+-----------------------------------------------------------------+
| Love seems the swiftest, but it is the slowest of all growths. |
| No man or woman really knows what perfect love is until they |
| have been married a quarter of a century. --Mark Twain |
+-----------------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Trailgalore said:

Who makes a 27 inch race tire?

There are Continental Supersports which might be fast enough. You can
often find 7/8" NOS Specialized on eBay.

Trailgalore said:

Who makes a 27 inch race tire?

Nobody. If you are looking for someone who makes "good" 27 inch
tires, it seems to be down to IRC triathlon 27x1" (bike nashbar, wire
bead, 260g), and Panaracer Pasela TG aramid belt, 27x1 (kevlar, 220g)
(hard as dickens to find anywhere.)

Both types of tires are on sale right now for $12.95 at bike nashbar,
but nashbar only has 27x1 1/8 panaracers (250g), sadly.

- Don Gillies
San Diego, CA

Sheldon Brown said:

Sheldon "27" Brown
+-----------------------------------------------------------------+
| Love seems the swiftest, but it is the slowest of all growths. |
| No man or woman really knows what perfect love is until they |
| have been married a quarter of a century. --Mark Twain |
+-----------------------------------------------------------------+

So your had a bood day ?!

'ppy aniversary to both of you.

quote='Sheldon Brown'Trailgalore said:

Who makes a 27 inch race tire?

Nobody now, but when Avocet discontinued theirs, we bought all they had.

We still have a good stock of the model 20 and 30 27 x 7/8, the fastest
27" tire ever made.

See: http://harriscyclery.com/630

Sheldon "27" Brown
+-----------------------------------------------------------------+
| Love seems the swiftest, but it is the slowest of all growths. |
| No man or woman really knows what perfect love is until they |
| have been married a quarter of a century. --Mark Twain |
+-----------------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com[/QUOTE]

Keep in mind that 2006 is the last year 27" tires are UCI legal if you are competing under their rules.

BTW, anyone know if that UCI 2007 700C only rule is going to be followed in triathlons?

Trailgalore said:

Who makes a 27 inch race tire?

IRC

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

quote='A Muzi'Trailgalore said:

Who makes a 27 inch race tire?

IRC

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971[/QUOTE]

Does IRC still make them or is there just a lot of NOS?
If NOS, any idea when they stopped making them?

meb said:

Does IRC still make [27 inch tires] or is there just a lot of NOS?
If NOS, any idea when they stopped making them?

Come on, this is a question that can be easily answered on your own...

http://www.irctire.com/start1.htm

I looked at the Nashbar Christmas catalogue this morning and there
were at least 6 name-brand models of 27" tires. This has got to be
some kind of a record.

Maybe Skye is bringing back the 27" tire on her new Bianchis ??
"Higher torsional Diameter", "More consistent traction through reduced
tread variance" (e.g. because fewer models of tires are available
for sale ... :-)).

- Don Gillies
San Diego, CA

Donald Gillies said:

I looked at the Nashbar Christmas catalogue this morning and there
were at least 6 name-brand models of 27" tires. This has got to be
some kind of a record.

Nope. We've got 16!

http://harriscyclery.com/630

Sheldon "Twenty-Seven" Brown
+-----------------------------------------------------------+
| It is by riding a bicycle that you learn the contours |
| of a country best, since you have to sweat up the hills |
| and coast down them. |
| Thus you remember them as they actually are, while in a |
| motor car only a high hill impresses you, and you have |
| no such accurate remembrance of country you have driven |
| through as you gain by riding a bicycle. |
| -- Ernest Hemingway, By-Line |
+-----------------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Quoted message said:

Quoted message said:

Quoted message said:

Trailgalore wrote:
Who makes a 27 inch race tire?

Quoted message said:

Quoted message said:

A Muzi Wrote:
IRC

meb said:

Does IRC still make them or is there just a lot of NOS?
If NOS, any idea when they stopped making them?

My supplier says 27x1 is current, 27 x 7/8 is gone

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

A Muzi said:

Quoted message said:

Quoted message said:

> Trailgalore wrote:
> Who makes a 27 inch race tire?

Quoted message said:

Quoted message said:

A Muzi Wrote: IRC

meb said:

Does IRC still make them or is there just a lot of NOS?
If NOS, any idea when they stopped making them?

My supplier says 27x1 is current, 27 x 7/8 is gone

If the casing and tread are the same, the 27x1 will be faster than the
27x7/8 on anything but the smoothest pavement.

--
Tom Sherman - Rock Island County Illinois
Tetrahedral carbon lattices are not forever.

Tom Sherman said:

If the casing and tread are the same, the 27x1 will be faster than the
27x7/8 on anything but the smoothest pavement.

Huh? That doesn't make any sense to me.

I was running Avocet 27 x 7/8s on my Rambouillet this summer and they
seem very fast indeed to me.

(I've taken them off for the winter, 'cause I don't do skinny tires in
the dark.)

Sheldon "Lighter And Skinnier Is Usually Faster" Brown
+------------------------------------------+
| To have doubted one's first principles |
| is the mark of a civilized man. |
| -- Oliver Wendell Holmes |
+------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Sheldon Brown said:

Tom Sherman said:

If the casing and tread are the same, the 27x1 will be faster than the
27x7/8 on anything but the smoothest pavement.

Huh? That doesn't make any sense to me....

Wider tires (of similar construction) at a given inflation pressure will
have less rolling resistance since less deformation of the casing is
required to form the contact patch. The bicycle will also be accelerated
less vertically over bumps with wider, more compliant tires, which saves
energy. The better ride of the wider tire will reduce rider fatigue,
which is an important performance consideration on longer rides.

The primary speed advantage of narrower tires is aerodynamics. The
effect of going from a 7/8 inch wide tire to an inch wide tire will not
be that significant at normal cycling speed. In addition, to obtain most
of the potential advantage of narrower tires, they need to be used on a
deep section rim of approximately the same width as the inflated tire.

--
Tom Sherman - Rock Island County Illinois
Tetrahedral carbon lattices are not forever.

Tom Sherman said:

Quoted message said:

Quoted message said:

If the casing and tread are the same, the 27x1 will be faster than
the 27x7/8 on anything but the smoothest pavement.

I replied:

Quoted message said:

Quoted message said:

Huh? That doesn't make any sense to me....

Tom:

Quoted message said:

Wider tires (of similar construction) at a given inflation pressure will
have less rolling resistance since less deformation of the casing is
required to form the contact patch.

That's true but meaningless in practice, because it is inappropriate to
use the same "given inflation pressure" on tires of different width,
when other factors remain the same.

I explain this in more detail in my Tires article at:

http://sheldonbrown.com/tires.html#pressure

Here's an excerpt from that article:

"A common debate among cyclists centers on the issue of whether a wider
tire has more or less rolling resistance at the same pressure. The
constant pressure is proposed because it appears more scientific to
eliminate this as a variable, but this is not realistic in practice. The
short answer to this question is that, yes, a wider tire of similar
construction will have lower rolling resistance than a narrower one at
the same pressure. This fact is, however, of no practical value. If you
are comparing two tires of similar construction, with the same load, and
the same pressure, either the wider tire is overinflated, or the
narrower tire is underinflated!"

Sheldon "An Old Fallacy" Brown
+-------------------------------------------------+
| To stay young requires unceasing cultivation |
| of the ability to unlearn old falsehoods. |
| --Robert A. Heinlein |
+-------------------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

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

Quoted message said:

Tom Sherman said:

Quoted message said:

> If the casing and tread are the same, the 27x1 will be faster than the
> 27x7/8 on anything but the smoothest pavement.

I replied:

Quoted message said:

Quoted message said:

Huh? That doesn't make any sense to me....

Tom:

Quoted message said:

Wider tires (of similar construction) at a given inflation pressure will
have less rolling resistance since less deformation of the casing is
required to form the contact patch.

That's true but meaningless in practice, because it is inappropriate to
use the same "given inflation pressure" on tires of different width, when
other factors remain the same.

I explain this in more detail in my Tires article at:

http://sheldonbrown.com/tires.html#pressure

Here's an excerpt from that article:

"A common debate among cyclists centers on the issue of whether a wider
tire has more or less rolling resistance at the same pressure. The
constant pressure is proposed because it appears more scientific to
eliminate this as a variable, but this is not realistic in practice. The
short answer to this question is that, yes, a wider tire of similar
construction will have lower rolling resistance than a narrower one at the
same pressure. This fact is, however, of no practical value. If you are
comparing two tires of similar construction, with the same load, and the
same pressure, either the wider tire is overinflated, or the narrower tire
is underinflated!"

Rolling resistance in real life is pretty meaningless. The real advantage of
a wider tire is comfort. A wider tire has more air volume thus allowing a
lower air pressure for greater comfort. Further, a wider tire will provide
better handling as there's more tread on the road.

Tom:

Quoted message said:

Quoted message said:

Quoted message said:

Wider tires (of similar construction) at a given inflation pressure will
have less rolling resistance since less deformation of the casing is
required to form the contact patch.

I replied:

Quoted message said:

Quoted message said:

That's true but meaningless in practice, because it is inappropriate to
use the same "given inflation pressure" on tires of different width, when
other factors remain the same.

I explain this in more detail in my Tires article at:

http://sheldonbrown.com/tires.html#pressure

Here's an excerpt from that article:

"A common debate among cyclists centers on the issue of whether a wider
tire has more or less rolling resistance at the same pressure. The
constant pressure is proposed because it appears more scientific to
eliminate this as a variable, but this is not realistic in practice. The
short answer to this question is that, yes, a wider tire of similar
construction will have lower rolling resistance than a narrower one at the
same pressure. This fact is, however, of no practical value. If you are
comparing two tires of similar construction, with the same load, and the
same pressure, either the wider tire is overinflated, or the narrower tire
is underinflated!"

An anonymous poster mentioned:

Quoted message said:

Rolling resistance in real life is pretty meaningless.

When you're talking about a 3 mm width difference, on otherwise similar
tires, I'd agree, but that was the topic under discussion. Actually the
issue was which is "faster", which is about more than just rolling
resistance. Even so, the difference is small.

There are, however, many millions of cyclists ridng on tires with very
significant rolling resistance, particularly thouse who ride knobby MTB
or hybrid tires on the street. Most of those folks have no idea how
much more pleasant it is to ride on smooth tires.

Quoted message said:

The real advantage of
a wider tire is comfort. A wider tire has more air volume thus allowing a
lower air pressure for greater comfort. Further, a wider tire will provide
better handling as there's more tread on the road.

No argument there. I cover this in the article referred to above.

Sheldon "Tires" Brown
+-------------------------------------+
| Natural laws have no pity. |
| --Robert A. Heinlein |
+-------------------------------------+
Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

Sheldon Brown said:

Sheldon "An Old Fallacy" Brown

Don't be so hard on yourself 🙂

Quoted message said:

Tom Sherman said:

If the casing and tread are the same, the 27x1 will be faster than the
27x7/8 on anything but the smoothest pavement.

Sheldon Brown said:

Huh? That doesn't make any sense to me.
I was running Avocet 27 x 7/8s on my Rambouillet this summer and they
seem very fast indeed to me.
(I've taken them off for the winter, 'cause I don't do skinny tires in
the dark.)
Sheldon "Lighter And Skinnier Is Usually Faster" Brown

I don't know for sure in this case. Tom's probably
referring to the phenomenon that, in some conditions, tires
do exhibit a j-curve, extremely skinny ones being less
efficient than merely kinda skinny ones.

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