North Rim Loop is a 37 mile loop trail located near North Rim, AZ. The trail is rated as moderate and primarily used for mountain biking.
Love Love LOVE the North Rim! Never crowded, and while the drop into the canyon isn't as precipitous, the 1000+ft elevation above the South Rim gives you an incredible view of what feels like half of Northern AZ. I was hiking, and so didn't cover the whole trail, but I wish I'd had a bike with me :(