Sprocket thread

Submitted by Pilagou on Sun, 10/29/2023 - 16:37

Sorry for the newbie question but what threading are the old (1937) sprockets on CCM coaster brake hubs. When I saw it was a threaded sprocket I kinda assumed it would be the same threading as the current fixed-gear standard. But I obviously assumed wrong. Mostly a curiosity question as don't think I will try to re-use the hub. 

3 Comments

Submitted by jdwillia on Sun, 10/29/2023 - 19:03.

The diameter of the threaded hole on the CCM sprockets is slightly llarger than the track hub sprockets. The spricket lock ring may be the same.

Submitted by jdwillia on Sun, 10/29/2023 - 19:07.

If you are going to remove the sprocket, it is best to do it wirh the hub assembled and still spoked in a wheel using a sprocket removing tool that has a skall chain attached. Yje lock ring is left hand thread and requires a toothed lock ring removal tool.

Submitted by Pilagou on Sun, 10/29/2023 - 19:15.

Oh I got it off. I was just surprised to find a thread size that I had never encountered before. Definitely not the kind of sprocket one will find at the LBS.