On the Burke-Gilman Trail, you will see a melange of biker species that comprise Seattle's teeming cycling community: competitive roadies suctioned head-to-toe in matching lycra, lay-cyclists out for the views, aloof bike messengers pierced in double-take places, downtown commuters bedazzled with blinky lights and reflectors, students getting somewhere fast and cheaply, weekend warrior dads working off the muffin-top, vegan earth-lovers determined to live sustainably and any mix thereof.