Fingerboards can be made with 9.5" or a 12" radius.
The 7.25" radius is rounder and therefore its geometry will not allow for very low action, but it feels great. We set all our guitar's action to .060" from the high E string to the top of the 12th fret and that suits most folks. Just right.
A 9.5" radius is a bit flatter than a 7.25". It can accommodate a lower action, so it can feel faster to some and 12" is even flatter.