Join Date: May 2015
Location: 40 miles from the Dragon
Piece of glass on the fork columns should sit flat.
Distance to rim from each fork column should be the same.
Vertical alignment, bike up against straight wall, measure from top and bottom of each rim to wall.
I haven't done this on motorcycle, just bicycle, but lay out paper on road and ride straight over it, see whether tires are tracking in the same place. Several back and forth can tell a bit.
50 miles from DGMR
2009 Versys 650
2014 Moto Guzzi California 1400