The Suzuki V-Strom 250 (not SX250 as you mentioned) is a lightweight adventure motorcycle that is suitable for a wide range of riders, including those with a height of 5'6" (167.6 cm). However, the suitability of a motorcycle's size and ergonomics ultimately depends on your individual body proportions and preferences.
The seat height of the Suzuki V-Strom 250 is approximately 31.9 inches (81 cm), which is relatively low for an adventure-style motorcycle. This lower seat height should make it more manageable for riders with average or slightly shorter inseams. Additionally, the bike's slim design and narrow seat can also contribute to a more comfortable riding experience for riders of various heights.
It is important to visit a Suzuki dealership or sit on the motorcycle in person to assess whether you can comfortably reach the ground with both feet while seated on the bike. Being able to firmly plant your feet on the ground while stopped is crucial for stability and maneuverability, especially at lower speeds or when parking.
Furthermore, you should also consider your riding style, intended use, and personal comfort when choosing a motorcycle. Taking a test ride or seeking the assistance of a knowledgeable salesperson can provide valuable insight into whether the Suzuki V-Strom 250 is a suitable choice for you based on your height and preferences.