I live in Thornhill and take it from me the north of Cardiff may not be mtb heaven but its not bad.
I ride 3 times a week taking in various routes on the Caerphilly Ridgeway, Draethen woods, up to the mast in Machen, through the woods at the top of Rhiwbina Hill, around the trails behind Castell Coch, on the network of trails behind the quarry in Morganstown and up and over the Garth in Gwaelod to name just a few places. You can also ride from Cwmcarn back to Cardiff without touching a road !
If not on my own I ride with a small friendly crowd who are always happy for a newbie to tag along.
If you're interested I'll let you know when we're riding next ?
Anyone else ?
I love my Specialized Stumpjumper ! (Sad I know.... but true)