While there are some mountain bike clubs – Peak District MTB springs to mind as a particularly prominent example
I’m not sure that Peak District MTB is a club or collective, it’s far more of an advocacy group than a riding one. It also, irritatingly, stipulates that to be.a full member you have to live within the boundaries of the Peak District National Park, which given that those boundaries were specifically chosen to exclude large population centres, like Glossop, Buxton etc, so I can live on the fringe of the park, ride mostly in it, but have no say in its running or policies. Which arguably makes it rather not collective.
So, collectives, great. Peak District MTB no so collective – it is that way because the Peak District National Park Authority wanted it that way, go figure. Sorry it just kind of irks me.