The why. Simple, it's the recession. Those who felt the effects of the recession decided that the bike they were riding would suffice and purchasing a new or newer bike wasn't a necessity. This decision added a few years to the length of ownership, which added more miles. And while the annual mileage might not have been much more, these owners are now starting to trade up older, higher-mileage bikes. Where you could count on a bike three to four years old with, say, 15,000 miles, now we're seeing five- to seven-year-old bikes with nearly double that. There is also some truth to the theory that these owners are keeping bikes longer and riding them more rather than buying new, adding the trinkets, and admiring their work with an elbow on the workbench. That also raised the average miles per year.