Southwest of Slatyfork and Snowshoe in the Monongahela National Forest, the Kennison Mountain Trail (#244) is a challenging 20+ mile loop with plenty of vertical.
To reach the mountain biking trailhead from Lewisburg, head north on US219 from US64 through Hillsboro. Head west on SR39/55 to the Cranberry Mountain Visitors Center. Just past the Center, proceed north on FS102 to the end (past the Glades).
From the FS102 trailhead parking, continue on FS102 for roughly seven miles past the South Fork Trail and several Adirondak shelters. At the junction with the KMT, head south across the Cranberry River and climb 1000 feet vertical over the next mile. Follow the KMT as it runs the narrow and rolling Kennison Mountain Ridge for the next 9 miles over rocks and rhododendron roots. Continue on the KMT past the Frosty Gap trail and descend rapidly 400 vertical to the South Fork Trail. For the short route back, the SFT heads northeast back to FS102. For the long route back, continue on the KMT across SR39/55 and climb the Blue Knob Trail. Drop off Blue Knob to pick up the Pocoahontas Trail (#263). Head east on the PT for 2 miles descending 600 via switchbacks. Near the bottom, take the first trail on the left leading to the intersection of SR39/55 & FS102. Follow FS102 back to the trailhead.