America is a big, sprawling place, vast enough that no one can cover all of it in a lifetime. It is easy to be thirsty, to want to ride every inch from the blue stone shores of Maine to the wide expanses of Nevada. But sometimes it's best to leave those miles unridden. Everyone has different thresholds for when it's too hot, too cold, or too wet to ride. The same goes for state of mind, your health, and your level of conditioning. When do these variables form enough of a distraction to merit leaving the bike in the garage? When does exposure to riding conditions make the risk greater than the reward? Here's where we might draw the line.