I just spent 2 weeks in CO, sampling the riding in various areas (Salida, Crested Butte, Durango). I am from PA and live at 1,000 feet and the nearby mountains *soar* to the height of 3,000 ft. I am over 40 and somewhat fit, but by know means a serious athlete.
Altitude acclimation is the biggest issue. It various from person to person, but it takes time. After 2 weeks, I did not feel like I was acclimatized.
I brought stuff to do overnighters, but decided not to for various reasons.
Besides the altitude challenge, the sun is relentless.... in the east, there is serious shade, in CO, not so much.
In my opinion:
1. The appeal of CO is the scenery. A++. Mountains, wildflowers, old mining ruins, etc
2. The mountains are huge. The climbs and descents can be really long (like intimidating long, climbs that can take hours).... The paved roads have shallow grades compared to some of the roads in PA and WV.
3. In my experience, the trails are not that technical... in 2 weeks I think I encounter one blowdown over a trail.... to me, it is almost unnatural how smooth some of the trails are...
4. ATVs and dirt bikes.... a lot of trails and forest roads are open to them... they are pretty popular... they are good at kicking up dust, but the operators seem to be pretty polite and I didn't have any issues.
5. Wilderness 'feel' was lacking for me, I never felt like anyplace was remote... not like in the east, when you are down in some valley, under the canopy with no distinct landmarks and your field of view only extends 50 yards because of the density of the foliage.
6. It's amazing how much trail has been bench cut by hand.
7. Cycling is hugely popular in CO compared to where I'm from.
8. CO does not seem to have the proportion of overweight/obese citizens that rest of the country has.
9. Tourism is the lifeblood of many towns...CO is definitely over its quota of tourist towns.
10. The Mountain Bike Hall of Fame in Crested Butte was a disappointment. A couple of bikes, a handful of parts and a poster board about all the inductees.
11. In comparison to the mountains, the rivers are tiny... but there are flowing streams up high
12. The most memorable single track that I road was on the CO trail.
13. The ratio of miles of fence to head of cattle must be something like 100:1.
14. I drove out. The drive West isn't that bad, the return trip seems brutal.
My advice: Plan some flexibility in your plans and be conservative in what you think you can ride in a day.
Here are some pictures:
Near Salida
Moto Trail
Reno-Flag Trail near Crested Butte
The super hyped '401' near Crested Butte
CO Trail (Durango Area)
CO Trail
CO Trail
CO Trail
Hermosa Trail (Durango Area)