This is the Adjustment Tech ride height adjuster for the YZF-R1. By
turning the 15/16" nut, you can raise or lower the rear of the bike by
2+" in less than a minute. Installation is simple, just support
the rear of the bike and remove 2 screws.
Lowering the front can be accomplished by
loosening the allen head screws that clamp the forks. Adjustment Tech
is in Canada and can be contacted at 705-799-5139, ask for Andrew.