Some of these may be stretching the 2 hour mark but not by much. I get to Lexington in about 2 hours from outside of Middlesboro, KY.
Near Middlesboro you have Wilderness Trail Offroad Park.
There's Black Mountain in Evarts, KY.
Outside of Huntsville, TN is Brimstone Recreation.
You can also ride most of the Daniel Boone National Forest but I think just gravel roads.