question regarding tire sizing

JohnP said:

first, I know nothing about tires.
I currently have 700 25c tires on my bike. What does the 25c refer to? ( 25
centimeter radius? )
Am I able to get tires of another size?
If so what is the difference?

The "25" refers to the nominal width of the tire (25mm or about 1 inch).
700c refers to the diameter (don't ask!). You must use 700c tires on your
700c rims, but you could use different widths (e.g., 23mm or 28mm).

The link below will tell you everything you need to know and more:

http://www.sheldonbrown.com/tires.html

Art Harris

well I found my answer an I thought I would share if there is anyone like me
out there

Quoted message said:

Quoted message said:

Nearly all road bikes sold in North American bike shops use what are
commonly known as "700C" tires. The number refers to the approximate outside
diameter of the tire, in millimeters. The "C" indicates that it has an
inside (or bead-seat) diameter of 622mm. In Europe, there are also tires
with "A" and "B" inside diameters, but bikes using these sizes are not
generally available in North America. Adding to the confusion is the fact
that a 650C tire and a 700C tire do not use the same size rim. The width of
a 700C tire is also expressed in millimeters, so a 700Cx23 tire is 700mm in
diameter, by 23mm wide. Prior to the late 1970s, the tires and wheels of all
bikes sold in the U.S. were measured in inches, i.e. 27x1, and many
inexpensive bikes sold through discount stores still use this system. Even
though a 27-inch wheel and a 700C wheel appear similar in size, their tires
are not interchangeable. Michelin does not offer 27-inch tires.

Quoted message said:

Quoted message said:

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

Quoted message said:

first, I know nothing about tires.
I currently have 700 25c tires on my bike. What does the 25c refer to? (

25

Quoted message said:

centimeter radius? )
Am I able to get tires of another size?
If so what is the difference?

Thanks for the help

john

Thanks, the more info the better!

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

Quoted message said:

JohnP said:

first, I know nothing about tires.
I currently have 700 25c tires on my bike. What does the 25c refer to?

( 25

Quoted message said:

Quoted message said:

centimeter radius? )
Am I able to get tires of another size?
If so what is the difference?

The "25" refers to the nominal width of the tire (25mm or about 1 inch).
700c refers to the diameter (don't ask!). You must use 700c tires on your
700c rims, but you could use different widths (e.g., 23mm or 28mm).

The link below will tell you everything you need to know and more:

http://www.sheldonbrown.com/tires.html

Art Harris

s**t!

this is an incredible site!!!!
thanks

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

Quoted message said:

JohnP said:

first, I know nothing about tires.
I currently have 700 25c tires on my bike. What does the 25c refer to?

( 25

Quoted message said:

Quoted message said:

centimeter radius? )
Am I able to get tires of another size?
If so what is the difference?

The "25" refers to the nominal width of the tire (25mm or about 1 inch).
700c refers to the diameter (don't ask!). You must use 700c tires on your
700c rims, but you could use different widths (e.g., 23mm or 28mm).

The link below will tell you everything you need to know and more:

http://www.sheldonbrown.com/tires.html

Art Harris

Quoted message said:

Michelin does not offer 27-inch tires.

Michelin "World Tour" is a 27-inch tyre:

http://www.bicycletires.com/tek9.asp?pg=products&specific=jooplsd0

--
Robots don't kill people -- people kill people.
http://www.irobotmovie.com/

JohnP said:

s**t!

this is an incredible site!!!!

It is. Makes ya wonder how Sheldon "Carpals of Steel" Brown does it all.

Ron

Quoted message said:

thanks

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

Quoted message said:

JohnP said:

first, I know nothing about tires.
I currently have 700 25c tires on my bike. What does the 25c refer to?

( 25

Quoted message said:

Quoted message said:

centimeter radius? )
Am I able to get tires of another size?
If so what is the difference?

The "25" refers to the nominal width of the tire (25mm or about 1 inch).
700c refers to the diameter (don't ask!). You must use 700c tires on your
700c rims, but you could use different widths (e.g., 23mm or 28mm).

The link below will tell you everything you need to know and more:

http://www.sheldonbrown.com/tires.html

Art Harris

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

Quoted message said:

well I found my answer an I thought I would share if there is anyone like me
out there

Not quite, but a good effort nonetheless. You might want to re-read
Sheldon's article to see why.

Quoted message said:

Quoted message said:

Quoted message said:

Nearly all road bikes sold in North American bike shops use what are
commonly known as "700C" tires. The number refers to the approximate outside
diameter of the tire, in millimeters.

Actually, it's the outside diameter of the tire for which that size
rim was originally designed, even though that tire no longer exists --
see below.

< The "C" indicates that it has an

Quoted message said:

inside (or bead-seat) diameter of 622mm.

Yes, if the tire in question is a 700c. As you note later, a 650c
tire has different bead-seat diameter.

< In Europe, there are also tires

Quoted message said:

with "A" and "B" inside diameters, but bikes using these sizes are not
generally available in North America. Adding to the confusion is the fact
that a 650C tire and a 700C tire do not use the same size rim. The width of
a 700C tire is also expressed in millimeters, so a 700Cx23 tire is 700mm in
diameter, by 23mm wide.

Except that it's not 700mm, at least not anymore. The problem is that
the French sizing system was based originally on wheel sizes (outside
tire diameters), but as roads got better and tire tire casings got
tougher, thinner and lighter tires became possible. But you couldn't
ask everyone to throw away their wheels (or re-lace them with
different rims), so the new tires carried the designations of the
tires they replaced (based on the rims they fit on). Today, you won't
find a 700c tire that's 700mm. And "road" tires in the original "C"
width are pretty much confined to hybrids and loaded touring bikes --
few modern road frames can fit a tire that wide.

Peter Storey