You need to two measurements one from the axle and a fixed point on the back fender a) which is when bike rear wheel is unloaded (center stand) off the ground and b) bike upright standing on its own you will need a friend to hold the bike.
The Static sag:
Full fuel tank 25mm or (0.98 in)
Empty fuel tank 20mm (0.79 in)
If the static sag is less or more than the specified value above adjust the spring pretention of the shock absorber.
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