What is that feeling that overcomes us each time we wander into this two-wheeler superstore in the hinterlands to the north? Our palms sweat; our breathing becomes shallow; a goofy grin spreads across our mug; and we lose the ability to blink. Ah, yes...gear lust. Do we really need that nifty carbon-fiber, rear-suspension frame? Do we need a $3,000 poor-man's Porsche? We do. We do. We do. If you don't believe us, you've never experienced gear lust--or you're our wife. Although there are a few decent small bike shops in the Dallas area--including a smaller version of Richardson Bike Mart near White Rock Lake--this is Mecca for cyclists, offering everything from a full line of clothing, to bike-related coffee-table gewgaws, to a wide variety of recumbent, road, touring and mountain bikes.