Subscriber content previewBy CATHY BUSSEWITZAssociated PressiStock image [enlarge] Riding a bicycle can be a healthy, enjoyable and affordable way to get to work. NEW YORK — When 72-year-old Michael Roper rides his bicycle to and from the pub he owns in Chicago, he can't imagine a better way to commute. He's getting exercise, drifting through fresh air and catching glimpses of neighborhood life — a recently opened coffee shop or a diving owl at night —that he's convinced he'd miss if he were driving.