At 4,300m the air is crisp and I&rsquom breathless. I&rsquom concentrating too much on keeping my wheels spinning to figure which gets the higher score for my ragged chest &mdash the altitude or a road that refuses to remain at a steady plane. But for now it&rsquos shut up and pedal &mdash up to the figure silhouetted against the sky, where the road held promise of a few seconds of respite from the steep climb.