Once the bar is removed of all components and accessories, take
a level and mark the highest point of the outer end of the bar.
Take a ruler and draw a line 80 millimeters in length connecting
the two marks that were made in steps 3 and 4. We recommend
double-checking the length and that this is highest point of the
bar. The line must be at least 80 millimeters long so you can see
the line when it’s inserted into the cutting jig.
Make a second mark on the highest point near where the lockring
will be. Do this for both sides of the handlebar.
After marking an 80-millimeter-long line, go ahead and remove the
handlebar from the stem to prepare it to be cut. Repeat this for
both sides of the handlebar.