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

Thread Tools Search this Thread
Old 07-12-12, 07:46 AM   #1
Senior Member
Thread Starter
Join Date: Jun 2012
Location: CA / OR Border
Bikes: 2 old Schwinns + 4 dahons
Posts: 102
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Confused over buying Tires. ISO 57-559

I am new at all this new tire stuff. Need new tires.
Looking for 26 x 2.125
Has the ISO marking is 57-559.

Question... will any tire of that size fit? That is marked 26 x 2.125? What about 26 x 2.2 ?

I see Bike Nashbar has a sale going on, but yet when I look at the specs of the tires... I see no ISO reference.

And finally, any recommendation of a good tire to buy?
The bike is a combo street/ dirt bike.
No price restriction.
stevekk is offline   Reply With Quote
Old 07-12-12, 08:01 AM   #2
Gratuitous glib and snark
ThermionicScott's Avatar
Join Date: Aug 2011
Location: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)
Posts: 15,609
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 950 Post(s)
Generally, if the width marking is decimal as opposed to a fraction, it'll be a 559 rim, so it would work on your rims.
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
RUSA #7498
ThermionicScott is offline   Reply With Quote
Old 07-12-12, 08:51 AM   #3
Join Date: Apr 2011
Bikes: CCM Torino 76
Posts: 937
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yep. 26 X 1.5, 26 X 2.1, 26 X 1.9, 26 X 2.35 etc. will all fit on your rim. 26 X 1-3/8, 26 X 1-1/2 and similar will not work.
DCB0 is offline   Reply With Quote
Old 07-12-12, 08:55 AM   #4
Lord Chaos
Senior Member
Join Date: Aug 2009
Posts: 239
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That ISO marking means the tire is 57 millimetres wide, and fits on a 559mm diameter (bead seat) wheel. It's the metric version of what's called a 26" wheel in United States. Whether the tire will actually be 57mm wide on your bike depends on how wide your rim is; modern skinny rims will make the tire a bit narrower. You also don't know if they're measuring the casing diameter, or the extreme width over knobs if they project beyond the casing. Visit and look for the tire articles. There's lots of good info on that site.

As for specific tires: for mountain riding I like WTB Weirwolf. They've been reliable and have great traction, and even roll decently on the pavement part of my ride. I've also done well with Specialized Nimbus and Hemisphere tires. Don't much care for Panaracer because two of them have blown out the sidewall for no good reason that I could see. There are many, many tires in sizes to fit your bike.
Lord Chaos is offline   Reply With Quote
Old 07-12-12, 09:31 AM   #5
Asi's Avatar
Join Date: May 2010
Location: Bucharest, Romania, Europe
Bikes: 1989 Krapf (with Dura-ace) road bike, 1973 Sputnik (made by XB3) road bike , 1961 Peugeot fixed gear, 2010 Trek 4400
Posts: 497
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
In the imperial notation (inches/feet/etc.) and in various weird notation (like french with 700C/650B/700A/etc) are all a mangle of brand marks, and do not reflect the actual size of something.

26" is just a general size.. there are at least a dozen of different 26" rims (that require different bead diameter tyre). Also french notations with 700C is something with general outer diameter of 700mm (with tyre on), and to make a distinguish between at leas 3 types that were common (622/630/635/642) thy put something like A/B/C, so 700C is 622mm. A mash of notations that do not reflect a measurable dimension is decrypted in Sheldon Brown's site, to give accurate corresponding dimension with the ISO for each weird unnatural notation.

So some guys from the ETRTO made a clever thing to put notations of the actual size and description of the tyre and the rim.
So 559mm is the diameter of the bead diameter, all tyres marked with 559mm bead diameter fit a 559rim (with some recommendations about the maximum and minimum width of the tyre according to rim width, but nonetheless it fits anyway, while a 572mm will never fit a 559).
A 559x25J rim means 559 bead diameter, 25mm width between the beads, and J is the hook profile for the tyre that fits that bead, often omitted for bikes since it's not so important and not many variation exist. For a tyre a 37-559, 37mm width of the fully inflated to nominal pressure tyre, and 559 bead diameter.

Bottom line is: Stick to the ISO/ETRTO cause it's better and manufacturers all over the world converted to that (as in always having ISO notation)
That's a good thing to standardize and stick to the same things. Some converted to metric some to imperial. Bikes are still in the imperial area with the threading on BB, on FW hubs, pitch of chains (1/2" which is great to have 1/2" on ALL chains, just as well where we have ISO notation on tyres - it removes the confusion over some oddballs and deformed meaning of proprietary notation)

Last edited by Asi; 07-12-12 at 10:02 AM.
Asi is offline   Reply With Quote

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 02:45 AM.

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 and affiliated sites.
  • Ask a Question
    get answers from real people!
Click to start entering your question.