some people are built to perform best at 50 miles some at 50 metres and some at 550 miles. All depends on youre body make up (slow or fast twitch). I think i would perform best in a 100 mile plus race as my endurance and slow twitch muscles are abnormally better than my fast twitch. However i can train to improve sprints etc. that will allow me to easily whip a not so fit "fast twitch" cyclist.