In this YouTube video, Progressive Suspension displays how to set suspension sag on a 2004 Harley-Davidson Ultra Touring Motorcycle. Sag is typically how your bike settles on its suspension under the full weight of the rider.
This same process described in this video can be used when setting sag on most twin-shock street motorcycles.
Suspension setup is the key to riding safety, and proper adjustments will allow your motorcycle to run at it's maximum potential, regardless if you're riding a touring bike, a cruiser, sport tourer, sportbike, etc.
By following simple step-by-step procedures as the one explained here by Progressive for twin-shock street machines, riders can vastly improve on their motorcycle handling characteristics.