I've done it on a stock MK 2 Raleigh Chopper. From the Youth Hostel at the top of Llanberris, past the lakes then up the screes. From the top down the railway track to Llanberris then up the Lanberris pass to the Youth Hostel. DO NOT ATTEMPT TO DO THIS IT WILL KILL YOU. I'm not actually dead but I died about fifty zillion times that evening. I'm doing it again in July 2009 any chopper owners out there fancy it?