Take the road up the hill from the climbing centre, and where it meets the main road into Bedlinog, there is a single track on the other side which climbs up to join a mountain road. Turn Right over the railway bridge, then after about 50 yards turn Left up a farm track.
Just before you come to LLan Uchaf farm, there are two grassy climbs on your right. The first one is gentler and zig zags to the top of the ridge. Keep going straight over open ground until you come to the mountain road coming from Gelligaer. Just the other side of this road is a stone monument explaining about the ancient Celtic chariot tracks crossing the mountain.