This trail system is in close proximity to two of Korea's largest cities; Seoul and Incheon. So it can be very crowded. I would not recommend taking your bike out on the weekends. The trail starts in a popular section of the park, lined with ropes on the side of the trail. There's a trail that climbs to the top of the mountain and a trail that wraps around the mountain. Some of the neighboring hillsides to Gyeyangsan are less crowded and have good singletrack such as the trails near Danam-dong.
This trail is crowded on the weekends. But the terrain is pretty interesting. Many parts are smooth and there is a couple of technical rocky sections.
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