For a big and tall person like yourself, it's important to find a motorcycle that offers a comfortable riding position and sufficient legroom. Since you mentioned wanting a back seat, I assume you're looking for a motorcycle that can accommodate a passenger as well. Here are a few options to consider:
Cruiser motorcycles: Cruiser-style bikes often have a relaxed riding position with forward foot controls, allowing for a more stretched-out leg position. They also tend to have comfortable seats and are well-suited for long rides. Models like the Harley-Davidson Road Glide, Yamaha Star Venture, or Indian Chieftain may be worth exploring.
Touring motorcycles: Touring bikes are designed for long-distance rides and offer excellent comfort and amenities. These motorcycles typically have spacious seating, adjustable windshields, and features like saddlebags for storage. Consider options such as the Honda Gold Wing, BMW K 1600 GTL, or Kawasaki Concours 14.
Adventure motorcycles: Adventure bikes provide an upright seating position and often have adjustable ergonomics, allowing you to tailor the fit to your preferences. Models like the BMW R 1250 GS, KTM 1290 Super Adventure, or Yamaha Super Ténéré could be suitable choices.
When choosing a motorcycle, it's important to visit dealerships or sit on different models to determine which ones offer the most comfortable fit for your height and build. Additionally, consider factors such as seat height, legroom, and handlebar positioning, as these can greatly affect your riding comfort. Always prioritize safety and ensure that the motorcycle you choose is suitable for your skill level and riding experience.