Originally Posted by
Retro Grouch
I bought a 105 brake caliper a couple years ago that came with (I think) FOUR different length hex nuts.
I have Kestrel EMS Pro carbon forks on a couple of bikes and they came with the much longer brake nuts needed to compensate for their wider crown. The directions with these forks were very explicit that you must use the supplied nut.
I guess this was before carbon forks were so common and so variable that the brake manufacturers supplied the variety of nuts to fit all of the different possibilities.