More Teeth on the Speedo Gear Will Make Speedometer Read Lower, Right?

And something that I'm not clear on, and sorry for taking the discussion in a little bit of a tangent, The chart above and an online calculation tool that I have used both (for me) came up with a 41 tooth pinion... But if I go into the tech manuals and look at a comparable tire (14") the solution set was either a 19 or 21 tooth gear. Seemed like a pretty big jump to go from 17 tooth to 41 tooth when I'm only off about 10 MPH.

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