Dead Ringer is a fun singletrack in the JEM riding area. It extends from the upper (Highway 59) JEM trailhead downhill to end on Cryptobionic just north of Sheep Bridge Road. It was completed in early 2015, creating many new riding options in the JEM area. The trail was a joint project of the BLM and the Dixie Mountain Bike Trails Association (DMBTA).
Dead Ringer is five miles long with 500 vertical feet of elevation change. Most of the slope is in the top mile and a half. I'd rate it easy-intermediate in technical requirement.
Experienced beginners can ride this trail if they know how to get their butt off the saddle while the bike rocks. The western (downhill) end of the trail has a lot of quick up-and-down bumps, like the Goosebumps trail.