The Honda ST1100 is a larger touring motorcycle with a powerful engine, designed for long-distance rides and comfort. Given your height and previous experience with 250cc twins, the size and weight of the ST1100 may feel quite different and may require some adjustment.
Here are a few factors to consider when determining if the Honda ST1100 would be manageable for someone of your height and experience level:
Seat Height: The seat height of the Honda ST1100 is relatively high, which may make it challenging for riders with shorter inseams to comfortably reach the ground while seated. It's important to sit on the motorcycle and assess if you can comfortably plant both feet on the ground while maintaining stability.
Weight and Maneuverability: The ST1100 is a heavier motorcycle compared to a 250cc twin, which can affect maneuverability at lower speeds or in tight spaces. Take into account your comfort level with handling a larger and heavier motorcycle, particularly during slow-speed maneuvers or parking.
Riding Position: The ST1100 has a more upright riding position compared to a sportier 250cc twin. This can provide a more comfortable and relaxed riding experience for long distances, but it's important to ensure the riding ergonomics are suitable for your body type and preferences.
Power and Performance: The ST1100 has a significantly more powerful engine compared to a 250cc twin, with a larger displacement and higher torque. Familiarize yourself with the increased power and consider your comfort level with handling a motorcycle with more acceleration and potential top speed.
It's highly recommended to visit a Honda dealership or find an opportunity to test ride an ST1100 to assess your comfort and confidence with the motorcycle's size, weight, and handling. Additionally, consider factors such as the intended use of the motorcycle, the types of roads you plan to ride on, and your personal riding preferences when making a decision.