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Don't use a measurement with a load on the bike. When you hit a big dip or bump and bottom out, your chain will be supporting the bike.
On the centerstand, at the midpoint of the chain pull down moderately and the push up measuring the difference and adjust till it's 1 3/4".
For a whole lot of years I have used two lightweight steel angles, one on each side. The angles are 4" x 3" x 14ga steel x 7'-0" long. I drilled two 1/4" holes spaced enough so I can use two 1/4" x 6" bolts to clamp the rear wheel between the two angles. If the front tire is the same width as the rear, the alignment is done when the two bolts are snug-tight. Two of my bikes have a front tire 1" narrower than the rear so I have two strips of wood 1/2" thick to space between the angles and the front tire.
This arrangement holds the wheels in perfect alignment while I adjust the chain and then tighten the rear axle.
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Gale Gorman
Houston
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