Originally posted by Incidents Happen
...my Squier strat is fatter at the neck then it is at the peghead (21 fret to 1st fret), making the radius larger...

Not necessarily. The width of the fretboard does not determine the radius. The compound radius necks do have a longer radius at the body end of the neck, but most guitars have a constant radius along the full length of the fretboard.

Most fretboards are made with a jig that swings the material across the face of a belt sander. The surface radius is determined by the distance from the jig pivot to the sander. Older Fenders had a short radius, sometimes as small as 6", to make them easier to play. For bluesmen, and other string-benders, this was too much of a good thing, because bent notes at the high end of the neck would often 'fret out' because there was too much curve to the surface. Most Gibsons had a radius of about 10" or 12", which was much less likely to fret out on bends. Compound radius necks have a smaller radius at the nut, and gradually flatten out to a larger radius at the body end.