Having done Snowdon on a 90's MTB and come down the Llanberis path (up Rangers) we must have been nuts. I still ride that bike daily as a commuter. We walked Snowdon a few years ago and I couldn't believe how steep the scree section is just after the tunnel under the railway is. I was sliding down it on foot. No wonder we couldn't stop on canti brakes and had to drop the bikes just to stop before going off the side.