Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-25-10, 02:49 PM   #1
marvelous
Senior Member
Thread Starter
 
marvelous's Avatar
 
Join Date: Jul 2009
Location: Burlington, VT
Bikes: austro daimler
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
erto to iso conversion

what is a erto 622x15 in iso specifications
marvelous is offline   Reply With Quote
Old 09-25-10, 02:59 PM   #2
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 7,212
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 605 Post(s)
They're the same.
dabac is offline   Reply With Quote
Old 09-25-10, 03:00 PM   #3
marvelous
Senior Member
Thread Starter
 
marvelous's Avatar
 
Join Date: Jul 2009
Location: Burlington, VT
Bikes: austro daimler
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i'm replying to my own thread as i thought to measure the in question rim with my calipers and the outside the rim measures at 20mm my thought is then that the old erto was the inside bead seat width while the iso is the outside, is this correct?
marvelous is offline   Reply With Quote
Old 09-25-10, 03:02 PM   #4
marvelous
Senior Member
Thread Starter
 
marvelous's Avatar
 
Join Date: Jul 2009
Location: Burlington, VT
Bikes: austro daimler
Posts: 87
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by dabac View Post
They're the same.
they are not the same my friend there is no way you could ride on 15mm wheel measured from the outside of the rim
marvelous is offline   Reply With Quote
Old 09-25-10, 03:25 PM   #5
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 8
Posts: 28,519
Mentioned: 63 Post(s)
Tagged: 0 Thread(s)
Quoted: 3004 Post(s)
Must have been 4:20 at BBI when they taught that..
fietsbob is offline   Reply With Quote
Old 09-25-10, 03:26 PM   #6
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 30,244
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 642 Post(s)
The 622x15 means a rim 622 mm in diameter across the bead seat and 15 mm wide measured inside the tire channel. A specification like 622x23 would apply to a tire and it means it fits on a 622 mm rim and the time is 23 mm across it's outside width.

And, yes ETRTO and ISO specifications are identical. ETRTO (European Tire and Rim Technical Organization) was set up to rationalize and standardize the confusing mess of bike rim and tire sizes and ISO (International Standards Organization) accepted the ETRTO system intact when it defined bike rims and tires under its standards.
HillRider is offline   Reply With Quote
Old 09-25-10, 05:14 PM   #7
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 31,551
Mentioned: 212 Post(s)
Tagged: 0 Thread(s)
Quoted: 2472 Post(s)
Actually, the second measurement is not the width of the tire as measured directly. It is the effective width, which is calculated by spreading the tire out, measuring the distance between the beads, and dividing by 2.5. This is what I remember from reading the Sutherland's manual in 1983, so I could be remembering wrong.
__________________
Tom Reingold, [email protected]
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

"Donít buy upgrades. Ride up grades." -Eddy Merckx

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 09-25-10, 07:31 PM   #8
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 30,244
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 642 Post(s)
Quote:
Originally Posted by noglider View Post
Actually, the second measurement is not the width of the tire as measured directly. It is the effective width, which is calculated by spreading the tire out, measuring the distance between the beads, and dividing by 2.5. This is what I remember from reading the Sutherland's manual in 1983, so I could be remembering wrong.
OK, this may be the exact definition of tire width but to us ordinary users it is very closely approximated by measuring the outside width of the tire as mounted on a rim of standard width for the application.
HillRider is offline   Reply With Quote
Old 09-25-10, 07:44 PM   #9
tatfiend 
Gear Hub fan
 
Join Date: Nov 2008
Location: Reno, NV
Bikes: Civia Hyland Rohloff, Swobo Dixon, Colnago, Univega
Posts: 2,829
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Unfortunately a lot of rim manufacturers only list the outside width of their rims on their web sites rather than the ETRTO/ISO inside rim width which is the important width for choosing compatible tire sizes. The inside width is usually about 6 to 7mm less than the outside width. The difference inside to outside on the narrowest rims, 12 to 13mm inside width, may be as little as 5+mm.
__________________
Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro

Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/
tatfiend is offline   Reply With Quote
Old 09-25-10, 09:53 PM   #10
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 31,551
Mentioned: 212 Post(s)
Tagged: 0 Thread(s)
Quoted: 2472 Post(s)
Quote:
Originally Posted by HillRider View Post
OK, this may be the exact definition of tire width but to us ordinary users it is very closely approximated by measuring the outside width of the tire as mounted on a rim of standard width for the application.
Quite right, but I think it's useful to know how the specification is officially measured. It's close enough for me, but it's not the same as measuring the tire when inflated.
__________________
Tom Reingold, [email protected]
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

"Donít buy upgrades. Ride up grades." -Eddy Merckx

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 09-26-10, 12:11 AM   #11
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 7,212
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 605 Post(s)
Quote:
Originally Posted by HillRider View Post
The 622x15 means a rim 622 mm in diameter across the bead seat and 15 mm wide measured inside the tire channel. A specification like 622x23 would apply to a tire and it means it fits on a 622 mm rim and the time is 23 mm across it's outside width.

And, yes ETRTO and ISO specifications are identical. ETRTO (European Tire and Rim Technical Organization) was set up to rationalize and standardize the confusing mess of bike rim and tire sizes and ISO (International Standards Organization) accepted the ETRTO system intact when it defined bike rims and tires under its standards.
Couldn't have said it better myself!
dabac is offline   Reply With Quote
Old 09-26-10, 08:56 AM   #12
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 30,244
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 642 Post(s)
Quote:
Originally Posted by tatfiend View Post
Unfortunately a lot of rim manufacturers only list the outside width of their rims on their web sites rather than the ETRTO/ISO inside rim width which is the important width for choosing compatible tire sizes. The inside width is usually about 6 to 7mm less than the outside width. The difference inside to outside on the narrowest rims, 12 to 13mm inside width, may be as little as 5+mm.
I'm not sure about their web sites but the rims I have that give the ETRTO/ISO dimensions on the rim's decals do give the inside width. My CXP-33 rims are labeled 622-15 and an Alex R390 rim is labeled 622-13. My other rims have no dimensions on the labels so you have to find out for yourself.
HillRider is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:29 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    get answers from real people!
Click to start entering your question.
I HAVE A QUESTION