reach is the distance between The place where the brake is mounted
a horizontal line
to the top and bottom of the mounting slot for the brake-shoes.
a vertical perpendicular, 90 degrees, off the horizon line.
centers of bolts,holes, is the place dimensions are taken as standard practice.
4th post has a Picture , saying same thing..
Last edited by fietsbob; 03-04-15 at 04:06 PM.