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 |
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! |
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 |
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. |
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 |
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 |
rim notation
On 3/10/2018 10:30 PM, Emanuel Berg wrote:
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. 1/2 x 1/8" probably refers to the appropriate chain (which does have these measurements; 1/2" from pin to pin, and roughly 1/8" wide.) Mark J. |
rim notation
Mark J. wrote:
1/2 x 1/8" probably refers to the appropriate chain (which does have these measurements; 1/2" from pin to pin, and roughly 1/8" wide.) Great, thanks! -- underground experts united http://user.it.uu.se/~embe8573 |
rim notation
On 3/11/2018 12:30 AM, Emanuel Berg wrote:
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? Oh dear lord. Really? 3-spline sprockets are cheap and ubiquitous. They're 'quick change' in that the previous versions (mostly prewar) were all screw-on track sprockets. Standard format fits Sturmey, Shimano, SRAM-Sachs-F&S-Torpedo, Bendix, Durex, Centrix, and so on right down to $5 chinese child's coaster hubs. You can mix-n-match across brands and tooth count, change your gearing every morning if you like, sizes range 13t to 24t. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
rim notation
AMuzi wrote:
3-spline sprockets are cheap and ubiquitous. They're 'quick change' in that the previous versions (mostly prewar) were all screw-on track sprockets. Standard format fits Sturmey, Shimano, SRAM-Sachs-F&S-Torpedo, Bendix, Durex, Centrix, and so on right down to $5 chinese child's coaster hubs. You can mix-n-match across brands and tooth count, change your gearing every morning if you like, sizes range 13t to 24t. Another thing I have thought about doing is to flip the sprocket which has an inclination and is facing inwards by design/default, but flipping it might be better than padding with spacers/washers to get a better chain line, if indeed it can be done without complications as I suspect it can? -- underground experts united http://user.it.uu.se/~embe8573 |
All times are GMT +1. The time now is 03:56 AM. |
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
CycleBanter.com