If you’re willing to travel a bit there’s always Aberdare MTB, BIG club and they’ve usually got 1, 2 or even 3 group rides most weekends in South Wales and mid-week too – but they are, how do you say it? Crazy.
Summer is better than Winter of course, but as others have said hang about in the Lewis Arms for long enough and someone will come past, there’s loads of riding in North Cardiff and heading in all directions (bar south really).
If you’re still looking come BST you’re more than welcome to catch up with my mates and I at Castle Coch of a evening – we ride bike, we don’t circle jerk around cars or in the forrest – but we’re in the minority, bear that in mind 😉