The 2015 Tour de France began today. Rohan Dennis of Australia, who rides for the BMC team, won the first stage, an individual time trial of 8.57 miles. Dennis completed the course in 14:56, which is an average speed of 34.45 miles per hour. Incredible. To put it in perspective, I averaged 17.15 miles per hour during yesterday's 30.6-mile ride. Then again, I'm 58 years old.