My wife and I both currently ride an 11-year-old Yamaha FZ. She is 5′3″ and I am 5′8″; both of us weigh over 90 kg. I don’t feel confident that this bike is safe and responsive enough — it needs a lot of throttle, is hard to manoeuvre in traffic, and handles pothole-ridden city roads poorly, especially for pillion riding. I also have back issues. What would be the ideal bike for us to upgrade to so we can ride together comfortably, mainly in the city with potholes and occasionally on the highway?