I am 6’0″ and 185 pounds.
My ZZR-250 (a ninja 250 by any other name) easily does more than 80mph with me on it. I always out accelerate traffic.
Don’t listen to anyone who says you NEED 600cc they don’t know what they are talking about. Most likely they’ve never ridden a 250R and are just parroting what everyone else says. I have yet to meet someone who has ridden a ninja 250 for a full day and still claims it isn’t powerful enough.
“The two seconds between ‘Oh S**!’ and the crash isn’t a lot of practice time.”