Nanci,

I have never taken them on the bike, but I have hiked them across the Grand Canyon numerous times, where ultralight is a necessity.

The North Face Slickrock went on our last two week adventure. It is a single-wall design, half mesh, half nylon, and very light because the rainfly only has to cover half the tent. We're going on another epic hike in May, and we're gonna bring The North Face Pebble. This one only has one door, but is even lighter and has more ventilation - essential in some locales. When every ounce doesn't matter, I love the North Face RoadRunner. Also a two-door design. All three are free-standing.
(If you're noticing a trend, there used to be a North Face outlet store nearby, and we got some AMAZING deals. We cried when it shut down!)