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700c vs 26"



 
 
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  #11  
Old October 18th 05, 06:35 PM
hippy
external usenet poster
 
Posts: n/a
Default 700c vs 26"


Marty Wrote:

Do you think every town has a LBS? Or even one that is conversant
about
tyres?
And what if I see a 700B tyre? What's the difference between a C and a
B? Is the B going to be suitable for my rim? And what does the 700
refer
to anyway? If you measure your rim it's nothing like 700mm. Does it
convert to inches somehow? If I'm swapping my singles wheel with my
clincher wheel how much effect will it have on my speedo?
How the hell do I know if the manufacturers won't tell me!
For a while Velocity were making wrong sized rims and insisting the
tyre
manufacturers were making bad tyres. How do we work out who's right?
I just bought a Continental ultra sport that has 700 by 23C written on
it, is that the same as a 700c? Will it have the same diameter as 700
by
25? If the outside diameter is different then why do they call it 700?
These are things I like to know.


Every industry has their own terminology, rules, etiquette and
standards. They are not explained in detail, on every item, all the
time. Purchasing requires a little knowledge of the industry. This is
why there are websites like Sheldon's, books like "Food Blending for
Dummies", magazines like "PC Buying Tips"..

I assume you own a PC and use it to post here. When you bought it you
probably learned at some point what USB, SCSI, IDE, PCI, RAM, ROM, HDD,
FDD, PCIMCIA, etc meant.. right? Same deal with bikes and any other
industry - you might need to buy a book, browse a website or ask
someone for information. Try asking here

hippy


--
hippy

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  #12  
Old October 18th 05, 07:02 PM
Marty
external usenet poster
 
Posts: n/a
Default 700c vs 26"

hippy wrote:
Marty Wrote:

Do you think every town has a LBS? Or even one that is conversant
about
tyres?
And what if I see a 700B tyre? What's the difference between a C and a
B? Is the B going to be suitable for my rim? And what does the 700
refer
to anyway? If you measure your rim it's nothing like 700mm. Does it
convert to inches somehow? If I'm swapping my singles wheel with my
clincher wheel how much effect will it have on my speedo?
How the hell do I know if the manufacturers won't tell me!
For a while Velocity were making wrong sized rims and insisting the
tyre
manufacturers were making bad tyres. How do we work out who's right?
I just bought a Continental ultra sport that has 700 by 23C written on
it, is that the same as a 700c? Will it have the same diameter as 700
by
25? If the outside diameter is different then why do they call it 700?
These are things I like to know.



Every industry has their own terminology, rules, etiquette and
standards. They are not explained in detail, on every item, all the
time. Purchasing requires a little knowledge of the industry. This is
why there are websites like Sheldon's, books like "Food Blending for
Dummies", magazines like "PC Buying Tips"..

I assume you own a PC and use it to post here. When you bought it you
probably learned at some point what USB, SCSI, IDE, PCI, RAM, ROM, HDD,
FDD, PCIMCIA, etc meant.. right? Same deal with bikes and any other
industry - you might need to buy a book, browse a website or ask
someone for information. Try asking here

hippy



Uhmm..ok.
But you're missing the point. We know that ROM means Read Only Memory
and RAM means Random Access Memory because the letters give us a clue,
but what does 700C mean? It's not the outside diameter of the tyre and
it's not the rim size, so it doesn't actually impart any information
about the tyre. If the tyres were simply called what they are then
someone new to cycling could simply measure the rim and order the
appropriate tyre, they wouldn't have to ask anyone at all! Seems easy to
me. This is my last posting on this subject, it annoys me too much.
I hope you're still enjoying your travels.

Marty
  #13  
Old October 18th 05, 10:56 PM
hippy
external usenet poster
 
Posts: n/a
Default 700c vs 26"


Marty Wrote:

Uhmm..ok.
But you're missing the point. We know that ROM means Read Only Memory
and RAM means Random Access Memory because the letters give us a clue,
but what does 700C mean? It's not the outside diameter of the tyre and
it's not the rim size, so it doesn't actually impart any information
about the tyre. If the tyres were simply called what they are then
someone new to cycling could simply measure the rim and order the
appropriate tyre, they wouldn't have to ask anyone at all! Seems easy
to
me. This is my last posting on this subject, it annoys me too much.
I hope you're still enjoying your travels.


Okay, I guess it could be more logical, that would definately help. But
logic is often left by the wayside when it interferes with profit-making
or produces more work for Jimmy Beancounter.

hippy


--
hippy

  #14  
Old October 18th 05, 11:18 PM
dave
external usenet poster
 
Posts: n/a
Default 700c vs 26"

Marty wrote:
hippy wrote:

Marty Wrote:

Do you think every town has a LBS? Or even one that is conversant
about
tyres?
And what if I see a 700B tyre? What's the difference between a C and a
B? Is the B going to be suitable for my rim? And what does the 700
refer
to anyway? If you measure your rim it's nothing like 700mm. Does it
convert to inches somehow? If I'm swapping my singles wheel with my
clincher wheel how much effect will it have on my speedo?
How the hell do I know if the manufacturers won't tell me!
For a while Velocity were making wrong sized rims and insisting the
tyre
manufacturers were making bad tyres. How do we work out who's right?
I just bought a Continental ultra sport that has 700 by 23C written on
it, is that the same as a 700c? Will it have the same diameter as 700
by
25? If the outside diameter is different then why do they call it 700?
These are things I like to know.




Every industry has their own terminology, rules, etiquette and
standards. They are not explained in detail, on every item, all the
time. Purchasing requires a little knowledge of the industry. This is
why there are websites like Sheldon's, books like "Food Blending for
Dummies", magazines like "PC Buying Tips"..
I assume you own a PC and use it to post here. When you bought it you
probably learned at some point what USB, SCSI, IDE, PCI, RAM, ROM, HDD,
FDD, PCIMCIA, etc meant.. right? Same deal with bikes and any other
industry - you might need to buy a book, browse a website or ask
someone for information. Try asking here

hippy



Uhmm..ok.
But you're missing the point. We know that ROM means Read Only Memory
and RAM means Random Access Memory because the letters give us a clue,
but what does 700C mean? It's not the outside diameter of the tyre and
it's not the rim size, so it doesn't actually impart any information
about the tyre. If the tyres were simply called what they are then
someone new to cycling could simply measure the rim and order the
appropriate tyre, they wouldn't have to ask anyone at all! Seems easy to
me. This is my last posting on this subject, it annoys me too much.
I hope you're still enjoying your travels.

Marty


I always heard it was 700 cm rolling distance per turn of tire .. C for
clincher type rim, but really who the hell cares? Its the tire size
you need if you have a modern roady. Your only going to get it wrong once.

Try shooting. .17 .17magnum. .22 .22LR .22 short. .22magnum
..22/250 .222 .32 .38 .41 .44 .44mag .44.40 .45 .50 .500 .600nitro
..357 .357mag 6mm 7mm nine 10mm 410 12Guage 10guage , get it wrong
and it might just blow your hand off

  #15  
Old October 20th 05, 08:50 PM
external usenet poster
 
Posts: n/a
Default 700c vs 26"


Marty wrote:

Uhmm..ok.
But you're missing the point. We know that ROM means Read Only Memory
and RAM means Random Access Memory because the letters give us a clue,
but what does 700C mean? It's not the outside diameter of the tyre and
it's not the rim size,


The same is true of "26 inch."

Actually, when these designations originated, they _did_ refer to the
outside diameter of the tyre. "700C" tyres were originally 700 mm in
diameter.

However, as time went by and roads got smoother, people started running
narrower and narrower tyres on the same rims, so the outside diameter
inevitably shrank.

so it doesn't actually impart any information
about the tyre. If the tyres were simply called what they are then
someone new to cycling could simply measure the rim and order the
appropriate tyre, they wouldn't have to ask anyone at all!


Right, that's the reason for the ISO/E.T.R.T.O. system. "700C" tyres
fit ISO 622 rims. This problem has already been solved, but not
everybody in the industry has gotten with the programme yet.

There's really no reason to actually _measure_ rims nor tyres though,
because the size is generally moulded into the sidewall of the tyre.
Most tyres are clearly marked both in the obsolete systems such as
"700C" _and_ in the modern ISO system. All you need to do is read the
numbers.

I explain the history and details of tyre sizing in excruciating detail
at:

http://sheldonbrown.com/tyre-sizing

Sheldon "ISO/E.T.R.T.O." Brown
Newtonville, Massachusetts

(Don't blame me, I voted for Kerry)

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

  #16  
Old October 20th 05, 08:50 PM
external usenet poster
 
Posts: n/a
Default 700c vs 26"


Marty wrote:

Uhmm..ok.
But you're missing the point. We know that ROM means Read Only Memory
and RAM means Random Access Memory because the letters give us a clue,
but what does 700C mean? It's not the outside diameter of the tyre and
it's not the rim size,


The same is true of "26 inch."

Actually, when these designations originated, they _did_ refer to the
outside diameter of the tyre. "700C" tyres were originally 700 mm in
diameter.

However, as time went by and roads got smoother, people started running
narrower and narrower tyres on the same rims, so the outside diameter
inevitably shrank.

so it doesn't actually impart any information
about the tyre. If the tyres were simply called what they are then
someone new to cycling could simply measure the rim and order the
appropriate tyre, they wouldn't have to ask anyone at all!


Right, that's the reason for the ISO/E.T.R.T.O. system. "700C" tyres
fit ISO 622 rims. This problem has already been solved, but not
everybody in the industry has gotten with the programme yet.

There's really no reason to actually _measure_ rims nor tyres though,
because the size is generally moulded into the sidewall of the tyre.
Most tyres are clearly marked both in the obsolete systems such as
"700C" _and_ in the modern ISO system. All you need to do is read the
numbers.

I explain the history and details of tyre sizing in excruciating detail
at:

http://sheldonbrown.com/tyre-sizing

Sheldon "ISO/E.T.R.T.O." Brown
Newtonville, Massachusetts

(Don't blame me, I voted for Kerry)

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

 




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