Yorkshire Grit - Bouldering on a bike

Shipley Glen. W. Yorks.

I spent a while watching a group of about 10 trial bikers practising their skills at Shipley Glen. I know the Glen from climbing: it's famous in the climbing world for its gritstone bouldering problems. (There are small crags and boulders up to about 5 metres high out of sight where the trees are). Their skills were very very impressive - rock climbing on bikes!
They were all men in their 20's - no women (not sure why).

They said they are part of an online group that meet up.
Bike trials are held here and can be seen on You tube.