KAYOTIC
You need to get that bike out of Colorado! We did a nice rail trail in Northern California that was relatively flat. That said, my BF loves to climb, so we rarely look for flat trails, although I wouldn't mind that now and again.
MOTIVATED@LAST
Thanks for the link to Triple Bypass - looks suitably challenging, but a bit far away from me. But I am signed up for a hilly local Fondo in late January - 150 miles and 15,000 feet of climbing. 749 days ago