A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Techniques
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

rim notation



 
 
Thread Tools Display Modes
  #1  
Old March 10th 18, 11:55 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default rim notation

Today I saw a rear wheel rim with the
Torpedo 1SP hub. On the rim are the digits

20-635 18/8

* 20 can be the inner rim width in mm

* 635 is most likely the rim diameter and
familiar ISO/ETRTO tire designation, also
in mm

* 18 could be the number of spokes, as the rim
has 36 spokes (360 degree wheel) and 18*2=36
- but, the sprocket is 18T, so maybe that is
it?

* 8 - the sprocket diameter in cm? If so, the
"18T theory" is more likely.

--
underground experts united
http://user.it.uu.se/~embe8573
  #2  
Old March 10th 18, 01:45 PM posted to rec.bicycles.tech
Sepp Ruf
external usenet poster
 
Posts: 454
Default rim notation

Emanuel Berg wrote:
Today I saw a rear wheel rim with the
Torpedo 1SP hub. On the rim are the digits


Factory markings on a bicycle rim will not designate any sprocket dimension.

20-635 18/8


[trollian interpretations of "18/8"]

Smoke way less of that CO-producing stuff, instead, do finally order a
poster printed table of stainless steel qualities!
  #3  
Old March 10th 18, 02:21 PM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default rim notation

Sepp Ruf wrote:

20-635 18/8


[trollian interpretations of "18/8"]

Smoke way less of that CO-producing stuff,
instead, do finally order a poster printed
table of stainless steel qualities!


I didn't now that in Germany you measure the
dick in chromium and nickel percentages...

--
underground experts united
http://user.it.uu.se/~embe8573
  #4  
Old March 11th 18, 03:16 AM posted to rec.bicycles.tech
John B.[_3_]
external usenet poster
 
Posts: 5,697
Default rim notation

On Sat, 10 Mar 2018 14:21:15 +0100, Emanuel Berg
wrote:

Sepp Ruf wrote:

20-635 18/8


[trollian interpretations of "18/8"]

Smoke way less of that CO-producing stuff,
instead, do finally order a poster printed
table of stainless steel qualities!


I didn't now that in Germany you measure the
dick in chromium and nickel percentages...


18-8 is a general designation for stainless steel having approximately
(not exactly) 18% chromium and 8% nickel.

The term is very none exact and can be used for almost any of the 300
series, 302, 302HQ, 303, 304, 305, 316, etc., which do have different
properties.
--
Cheers,

John B.

  #5  
Old March 11th 18, 03:21 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default rim notation

John B. wrote:

18-8 is a general designation for stainless
steel having approximately (not exactly) 18%
chromium and 8% nickel.

The term is very none exact and can be used
for almost any of the 300 series, 302, 302HQ,
303, 304, 305, 316, etc., which do have
different properties.


OK, great!

I also found

18 Z 1/2"

on the sprocket. I suppose 18 is the number of
teeth, and 1/2" is the diameter of the wheel
axle hole .

On the hub shell, it says 36 which again
I suppose is the number of spokes (indeed
18*2=36), but it also says 2.8...?

Spokes are 2mm or 2.2mm at the elbow so perhaps
it is the spoke hole diameter in mm on the
hub flanges?

--
underground experts united
http://user.it.uu.se/~embe8573
  #6  
Old March 11th 18, 07:30 AM posted to rec.bicycles.tech
Emanuel Berg[_2_]
external usenet poster
 
Posts: 1,035
Default rim notation

18 Z 1/2"

The Torpedo sprockets come in different
flavors. The 3SP (Triplex/Dreigang) I have are
19T, the Duomatic is 20T.

The letter "Z" is the German "Zahn" for
"tooth", plain and simple.

The Duomatic has a sprocket, or a

Zahnkranz 1/2 x 1/8" aufsteckbar

"aufsteckbar" is "attachable" so the inches
probably refers to something that has to do
with that.

It also says

(s. Liste Nr. 196.6/8)

anyone has that one lying around?

--
underground experts united
http://user.it.uu.se/~embe8573
 




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
English tire width notation Emanuel Berg[_2_] Techniques 7 February 23rd 18 06:38 PM


All times are GMT +1. The time now is 01:34 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 CycleBanter.com.
The comments are property of their posters.