A friend, who had ankle surgery some years ago, says his ankle does well for 50-mile rides, but that's its limit. I rode 47 miles today and the ankle did fine. Fine is a relative term. The ankle swells at the end of the day daily somewhere between the instep and the ankle bone, toward inside of the foot. It's sore to the touch. The soreness is either from scar tissue or screw heads hitting the skin. I'm seriously contemplating having the screws removed.