I recently bought a Sawstop PCS and was suddenly made aware that saw blade sizes are not uniform. As I was setting up the saw, I could not get the riving knife adjusted below the level of the blade. I called Sawstop technical service to see if I was doing something wrong, and the rep asked what brand of blade I was using. When I told him it was a Freud (Industrial), he told me to measure it. Sure enough, it was significantly smaller than 10", though I can't recall the exact diameter now. He said he had fielded many calls of this type and most of them were with Freud blades. This blade was brand new, so the smaller size was not a result of repeated sharpenings. The Sawstop rep's theory is that Freud's blades are made to a metric standard.
The fix for the riving knife was simply to grind a little bit off the top, which was no big deal. The small blade size does cause a bigger problem for me, though. When I switch over to my Freud 8" Super Dado set and the Sawstop dado brake cartridge, I have to adjust the spacing between the blade and the brake. When I was looking at table saws, one of my biggest hesitations about going with the Sawstop was the time necessary to switch between the dado brake cartridge and the blade brake cartridge. More than one salesperson assured me that it was quick and easy and that I would not need to adjust the spacing each time. I assume that is true with true 10" blades and true 8" dado sets, but it is not the case with my Freud blades.
I like Freud's upper level blades, but I am likely to switch in the future because of this issue. I also have some concern that I won't be able to use the blade on the Sawstop after repeated sharpenings, as it might be too small to work with the brake cartridge. Just wanted to let others who have or are considering buying a Sawstop know that they should measure their sawblades before buying.