There are many unofficial Downhill trails in Clyne. Some of them are excellent but beware there are some big jumps and some very steep sections. If you spot a new track make sure you check it out properly before you ride it as you don't want to be into something big without knowing it is there.
Clyne Riders are currently working with Swansea Council to try and legitimise these trails and make sure they are all of a good standard. Unfortunately it is proving very difficult to get a suitable agreement agreed with the council and until that time we can't say any more.
Check out the Clyne Riders board on the MtbPigs forum
or the CR Facebook Page
for more info.