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.