trail is over thought in many cases
as the be all and end all
74 HTA/40mm
73 HTA/45mm
72 HTA/50mm
all give the same trail
but different geos
and they all do not feel the same in a bike if all the rest of the geo is the same
there is so much other stuff going on
position first
bike design under neath that

this subject is fraught with peril when discussed in forums