These URLs are about specific HPVs: bikes, trikes, and quads: who makes 'em, how to get them, what they cost. In here you'll find references mostly to the more unusual varieties (you can go to any bike store to see stock MTBs and road bikes) -- recumbents, folders, cargo carriers, etc. Also I'll mention some accessories that make bikes more practical for daily commute and shopping trips.The most familiar HPV is the bicycle. But let's not completely forget the skateboard, the scooter, the kid's trike; the wheelchair, the rowboat, pedalboat (or pedal kayak!), rowbike, and roller skates! Confining ourselves to the land for now, anything that uses human muscle to turn wheels and thus roll along is an HPV. Here I'm going to focus on bikes and bike variants.