a lot of it has to do with how solid your setup is. my first bike, 30 felt terrifying, but my latest bike feels safe all the way to the fastest it's gone at 67 miles per hour. of course, 67 took a tiny sprocket, overinflated tires, and drafting, but it managed. normal gearing and normal conditions it is easily capable of 55 miles per hour and feels perfectly safe at that speed. it even stops good going that fast