Huw Oliver goes searching for singletrack gold in the arid mountains of Arizona. Words & Photography Huw Oliver My fingers yanked on the levers automatically, bypassing the usual thought processes and channels of communication, as if they knew what was needed before my brain did. Tyres tried lamely to bite into the loose, dusty surface, rocks rolled like marbles, and the world did that horrible slow-motion thing that it does when it’s about to do…