I haven’t ridden a bike for more than a week now, other than the 10-minute spin I was allowed at the physical therapist’s the other day.So what’s a recovering, red-blooded American boy to do?Fire up the old computer, of course, and hit the Interwebs for some good, old-fashioned bike porn.Hey, I can look, but I can’t touch, right?Doesn’t make me a bike-sexual, right? (Not that there’s anything wrong with that).I have to admit, I’m especially drawn to the old-school, lugged steel bikes. Must be the retro-grouch in me.And some of the smaller independent frame-makers make some really beautiful bikes, out of everything from steel to carbon to aluminum to bamboo (!) and even flax (!!).But during my recent forays onto the ‘Net, I have gravitated toward three bikes in particular. First up is the Ktrak, which really isn’t a bike at all. It’s a bike attachment that turns a mountain bike into an all-terrain bike. The Ktrak replaces the rear wheel with what looks like a tank track. A ski goes in place of the front wheel, allowing the cyclist to ride on any surface, especially snow. Truth be told, it looks more like a gimmick, something you’d haul up the hill and ride down, not something you’d actually pedal anywhere.I can’t keep my eyes off Kestrel’s Airfoil. The Airfoil has no seat tube. Instead of a frame made with two triangles, the Airfoil is shaped like a diamond. It’s a time-trial or triathlon-specific frame, and it just might be the sexiest bike I’ve ever seen. (I can say that, can’t I?) On the other end of the spectrum is a bike I actually might purchase — if I could justify such a narrow-use purchase. If the Kestrel Airfoil is the twiggy supermodel, the Surly Pugsley is the sturdy, voluptuous stepsister. I’d heard about the Pugsley before, but I’d never seen one in the wild until I happened upon one chained up outside my favorite downtown bike shop. In real life, the Pugsley is even more cartoonish than I’d imagined. The Pugsley is nothing but a mountain bike with bike tires. Really, really big tires. Huge, balloonish tires. While the Ktrak is designed to glide over snow, the Pugsley is meant to ride over it on that improbably large rubber. It’s supposed to ride well in sand, too, making it a dual-purpose ride.Since there aren’t any decent sandy beaches worth cruising around here, I’d only be able to pedal my Pugsley for the dozen or so rides to work when snow on the roads is too much for my regular mountain bike.Of course, none of those bikes is in my immediate future.So I’d better make sure there isn’t any incriminating evidence on the computer anywhere.Wouldn’t want my wife to get the wrong idea.