Thank you for your patience as I looked for 17T Suntour sprockets. I have this NOS ProCompe with lots of patina and a little rust on the spoke-side.


An Evaporust bath will certainly solve that issue.

Below is a great example of how sprockets show wear on the spoke-side first and then the outside.

Outside: Perfect sprocket on top. New Winner on bottom.

Spoke-side

As can be seen, the Perfect looks pretty good on the outside, but after it is flipped you can easily spot the wear. However, this doesn't mean the sprocket is no longer useable. If shifting is still acceptable continue to use.

The New Winner, on the other hand, clearly shows wear on the outside, and when it is flipped, the full extent of the wear is very apparent. I would never install this 17T on a freewheel that is going to be ridden.