I was wondering the same thing. Hopefully (fires and weather permitting), at the end of next month we will be camping near Leadville for a few days prior to climbing Mt. Elbert (our first 14'er) and we were going to ride bikes for a couple days prior to help with the acclimation.
I've decided on doing Hagerman Road up to Hagerman Pass. I think I'll be much more comfortable climbing jeep roads/forest service roads than riding singletrack. Our singletrack here in the flatlands has me nervous enough with the descents- I can't imagine the terror I would have to endure trying to descend some actual mountain trails.

Has anyone ever ridden Hagerman Tunnel Trail or the road?