07 rocket and axle drop

[tbaileyjr]

I have a 07 black front rocket and I was wondering how much axle droop I should have on the lr and do I measure it from the top of the birdcage to frame or do I measure from axle tube to frame

[C10]

off the top of my head from the rocket set up book it says with both rear wheels off the ground fully extended, start at 12 to 13 inches from the bottom of the rear frame rail to the top of the axel tube.