I ran across an article by Ted Stedman written for GreatOutdoors.com that outlined a number of good multi-day rides. Below are a few excepts from his article.
It's no secret that Colorado harbors some of the premier mountain bike tours on the planet. But what else would you expect in a state where thousands of miles of trails and dirt roads crisscross the high country other than premium rides?
Consider it bike packing - like a hybrid cross between backpacking and mountain biking - where a tent is your mobile shelter, all your provisions are carried on panniers or an off-road bike trailer, and your bike is a vehicle for discovery.
I love that term, "bike packing."
SAN JUAN HUT SYSTEM
The San Juan Hut System's 206-mile Telluride to Moab tour transports riders from Colorado's cool alpine mountain tops to the fiery deserts and redrock canyons of Utah's Moab. This route retraces the getaway route of gunslinger Butch Cassidy's gang after they robbed a Telluride bank in 1889.
There's something to this next one. We ought to look into it a bit more.
TABEGUACHE TRAIL
The first challenge of the Tabeguache Trail is to pronounce it (say "tab-a-watch"). The second is to resist the temptation to turn around and repeat the 144-mile ride that many riders swear is the archetype of western Colorado bike routes.
Coursing across valleys, mesas, pinion-juniper forests and remote BLM range lands, the Tabeguache is a snippet of classic Colorado. The trail got its start in 1988, when a fledgling group of resource-savvy mountain bikers calling themselves the Colorado Plateau Mountain Bike Association (COPMOBA) dedicated the elbow grease to create a contiguous link between Montrose and Grand Junction. By connecting existing dirt roads and ATV trails with 11 miles of newly built singletrack, the Tabeguache was born.
The Mother Trail.
GREAT DIVIDE MOUNTAIN BIKE ROUTE
Hikers have the Appalachian and Pacific Crest trails, fabled long-distance routes that are trophies for intrepid trekkers. Since its completion in 1997, the GDMBR offers mountain bikers a two-wheeled version of the same prize.
The 2,465-mile GDMBR is the unsurpassed monarch of mountain bike trails, the longest designated off-route route in the world...
COLORADO TRAIL
Cutting a swath across the Rocky Mountains from Denver to Durango, the 471-mile CT is a wild, daunting, epic undertaking for mountain bike touring. And it's probably the most scenic - and technical - multi-day ride offered in the southern Rockies.
Seven national forests, six wilderness areas, eight mountain ranges and five major river systems are traversed by the CT, a trail that owes its existence to volunteers and leaders who envisioned a recreational corridor linking existing trails with numerous access points.