The original instruction manuals, that came with mine, both show 13K Max. RPM w/B&C. However, I run mine at 12.5K also. I figured since they are over 20 years old, even though they are pristine, that it might be better on them. This was suggested to me by a saw pundit that posts a lot here on AS. I don't believe you'd notice much difference in the cut between 12.5 and 13K RPM.