See: https://wiki.openstreetmap.org/wiki/Israel#Names_of_unofficial_MTB_single-tracks

"Official mountain-bike (MTB) trails are represented using relations, as described above. In addition there are many unofficial single-tracks that have been named by the MTB community. Such single-tracks do not have relations. Instead, the mtb:name=* mtb:name:he=*, and mtb:name:en=* (optional) are placed on the way(s) themselves.

The mtb:name=* tags can also capture the name of a special segment within an official MTB trail. For example, the "סינגל הכלניות" segment of Beeri Single. "