As far as contact wheels go, I only use them to rough profile blades. 95% of my grinding is done on a flat platen. That being said, if your hollow grinding, most say that an 8" is the minimum for general purposes. Many makers I know use 10"-12", and I know a couple who are all the way up to a 14" wheel. The platen that I use has a 3" contact wheel on the bottom, and a 1 1/2" on the top. I do not hollow grind, so the contact wheels on the platen take care of all of the small contour work I need.
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