Pen Y Fan

My brithday next week am gona try and get mum to take me and my mate up 2 brecons with our bikes. I went last year and climbed pen Y fan by foot simple enough single track for 6 or 7 miles pretty steep but pretty fun and you cant get lost
Does any1 have any experience of doing this on a bike like what it is like and if there is any regulations as it can be the M5 sumtimes up there on a nice day ?
Cheers
Dan

Cheers
Dan
If mum would let me,id sleep with my bike 

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