'The Chamonix Bike Book' shows bikers the best places to ride on this side of the Mont Blanc Massif. There are mellow cruises and savage climbs, hihg-octane singletrack and punishing downhills. There is flowy, techy, exhausting, panoramic, windy, foresty, gentle and there's muddy - actually, the only thing these rides have in common is that they are all wonderful.