As a 5 ft 6 in rider, it is possible for you to have both feet flat on the ground when sitting on a Harley Davidson Street Glide, but it may depend on various factors, including your inseam length and the specific modifications made to the motorcycle.
The Harley Davidson Street Glide has a seat height of approximately 27.4 inches (69.6 cm). With the motorcycle's suspension compressed under your weight, you may be able to touch the ground with both feet flat.
For instance, the thickness of the seat padding, the width of the seat, and the riding boots or footwear you wear can impact your effective seat height.
It is always recommended to test ride the motorcycle before making a purchase to assess your comfort and reach. You should visit a Harley Davidson dealership or motorcycle shop to sit on the bike, preferably while wearing your riding gear, and gauge if you can comfortably reach the ground with both feet flat.
If you find that you are still not able to comfortably reach the ground, there are potential modifications that can be made to lower the seat height or adjust the suspension to better suit your needs. It's advisable to consult with a knowledgeable motorcycle dealer or customization expert who can guide you in finding the best solution for your specific requirements.