Originally Posted by Sleeper519
^ Easier to just carry a backup pair to the track with you and leave the grinder at home.
Doesn't everyone carry a belt sander in their car?
The weird part with some ST40 compatible shapes is some pads (as I found out) are 1mm thicker. Would have been OK with a more worn down rotor but mine were new so it wasn't close.
But...it is still a valid point that it is much easier to find an ST40 compatible pad than one for an ST60.