Yeah, as gugi stated, this has been combed over before. I have razors that are less that 1/2 inch wide with spines you could almost sharpen and shave with, and 8/8 blades with a spine over 1/4 inch wide. It is relative to the optimal bevel angle, and a very interesting topic to research. I have a few razors that have relatively narrow spines that I want to try narrowing to less than 4/8 just to see if the loss of blade width throws the geometry off enough to alter the edge. Happy hunting!