A Fitness & exercise forum. FitnessBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » FitnessBanter.com forum » Fitness & Exercise » Triathalon
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Tyre sizes



 
 
Thread Tools Display Modes
  #1  
Old June 16th 04, 02:36 AM
Brad Hubbard
external usenet poster
 
Posts: n/a
Default Tyre sizes

Can someone explain what the two measurements in a tyre size represent and
what would be the difference between the following?

(Diameter x Width? measured where?)
700x20c
700x25c
700x23c

I'm a newbie when it comes to road bikes.

Thanks,
Brad
  #2  
Old June 16th 04, 02:11 PM
Mark Hickey
external usenet poster
 
Posts: n/a
Default Tyre sizes

Brad Hubbard wrote:

Can someone explain what the two measurements in a tyre size represent and
what would be the difference between the following?

(Diameter x Width? measured where?)
700x20c
700x25c
700x23c


The "700" refers to the outside diameter of the rim (which is actually
622mm) and the tire. Obviously this isn't really exactly 700mm unless
you're running 39mm tires. It's an archaic standard that doesn't
really mean anything any more. In fact, there were several different
700 standards (the one that "stuck" being the 700c standard).

The diameter is normally measured across the widest part of the
mounted and inflated tire. However, the width of the rim affects this
measurement, and tire companies are all over the place in
manufacturing tires of a given "size". For example, some 25mm tires
are actually 23mm or less (a common ploy since it makes your "25mm
tire" look lighter than your competitors "real" 25mm tire).

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame
  #3  
Old June 16th 04, 02:11 PM
Mark Hickey
external usenet poster
 
Posts: n/a
Default Tyre sizes

Brad Hubbard wrote:

Can someone explain what the two measurements in a tyre size represent and
what would be the difference between the following?

(Diameter x Width? measured where?)
700x20c
700x25c
700x23c


The "700" refers to the outside diameter of the rim (which is actually
622mm) and the tire. Obviously this isn't really exactly 700mm unless
you're running 39mm tires. It's an archaic standard that doesn't
really mean anything any more. In fact, there were several different
700 standards (the one that "stuck" being the 700c standard).

The diameter is normally measured across the widest part of the
mounted and inflated tire. However, the width of the rim affects this
measurement, and tire companies are all over the place in
manufacturing tires of a given "size". For example, some 25mm tires
are actually 23mm or less (a common ploy since it makes your "25mm
tire" look lighter than your competitors "real" 25mm tire).

Mark Hickey
Habanero Cycles
http://www.habcycles.com
Home of the $695 ti frame
  #4  
Old June 21st 04, 01:03 AM
Brad Hubbard
external usenet poster
 
Posts: n/a
Default Tyre sizes

Mark Hickey wrote:
The "700" refers to the outside diameter of the rim (which is actually
622mm) and the tire. Obviously this isn't really exactly 700mm unless
you're running 39mm tires. It's an archaic standard that doesn't
really mean anything any more. In fact, there were several different
700 standards (the one that "stuck" being the 700c standard).


Thanks Mark,

That helps.

Cheers,
Brad

  #5  
Old June 21st 04, 01:03 AM
Brad Hubbard
external usenet poster
 
Posts: n/a
Default Tyre sizes

Mark Hickey wrote:
The "700" refers to the outside diameter of the rim (which is actually
622mm) and the tire. Obviously this isn't really exactly 700mm unless
you're running 39mm tires. It's an archaic standard that doesn't
really mean anything any more. In fact, there were several different
700 standards (the one that "stuck" being the 700c standard).


Thanks Mark,

That helps.

Cheers,
Brad

 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[USA Today] Bigger cut of the cloth: 'Plus' sizes for kids Adam Fahy Weights 0 May 4th 04 08:31 PM
Want to lose 4 sizes Healthy Stealthy ; Weights 27 January 26th 04 01:39 PM
Wayne,Bar & Plate sizes Lee Michaels Weights 3 October 27th 03 01:11 PM
sleeping bag sizes Andy Walking in the UK 10 October 16th 03 04:24 AM
Self repairing tyre tubes Harrow Triathalon 2 July 17th 03 12:23 AM


All times are GMT +1. The time now is 06:38 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 FitnessBanter.com.
The comments are property of their posters.