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Just set this up for grinding razors. For whatever reason, having the larger wheel has dramatically improved tracking. I also have a 4", 5" and smaller wheels down to 1/4" on separate arms.
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Yet to try a cubitron belt.sounds like it might be worthwhile!!

Try blaze belts if they'll fit your grinder. They last forever!!!

I don't know a great deal about razors but the info I've been given, and tried are that a 5" and 2" wheel are a good combo.
I also have a 10" and 14" wheel and both are far to large. Very little...