There are two short climbs way down on the singletrack that rudely awaken your legs and lungs. All this downhill means you need strong forearms for constant breaking and good handling skills for the varying trail conditions. You'll be out of the saddle with your legs acting like shocks much of the way. Thereafter, the Dark Hollow Trail turns constantly and descends rapidly. The Second Left Hand Canyon Road is blazing fast, but it can also be rutted and coated with pebbles that slide under your wheels like ball bearings.
Elevation gain is trivial.
The two short climbs below Paradise Spring amount to a couple hundred feet, max. Although you're freewheeling most of the time, you'll be sucking wind just the same because of the high elevation. Brian Head is a ski resort town, and snowdrifts can linger well into June. Flurries can dust the peak by late September. Apply sunscreen liberally.