Originally Posted by Creative Engineering
The .080" deflection over a span of 10 teeth, was probably created during the stamping process of the sprocket. The die was not set right and that area became forged under the pressure of the stamping process. A trip to your favorite shop that has both a Rockwell "C" scale tester and a Brinell tester will prove this out. I'm willing to bet that the area that is warped is also tough as spring steel due to the die off-set.
I was wondering why it was all in that short span. I usually like to take these cheap sprockets, and drill a hole pattern in them then paint them so they look a little better. This one isn't worth it. The flat stamped ones are pretty easy to straighten if they are out a little.